WO2005029756A2 - System and method for partially encrypted multimedia stream - Google Patents

System and method for partially encrypted multimedia stream Download PDF

Info

Publication number
WO2005029756A2
WO2005029756A2 PCT/US2004/006987 US2004006987W WO2005029756A2 WO 2005029756 A2 WO2005029756 A2 WO 2005029756A2 US 2004006987 W US2004006987 W US 2004006987W WO 2005029756 A2 WO2005029756 A2 WO 2005029756A2
Authority
WO
WIPO (PCT)
Prior art keywords
stream
encrypted
sfream
legacy
predetermined portions
Prior art date
Application number
PCT/US2004/006987
Other languages
French (fr)
Other versions
WO2005029756A3 (en
Inventor
Leo M. Pedlow, Jr.
Henry Derovanessian
Brant Candelore
Original Assignee
Sony Electronics, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Electronics, Inc. filed Critical Sony Electronics, Inc.
Priority to CA2517433A priority Critical patent/CA2517433C/en
Priority to EP04785864.2A priority patent/EP1609313B1/en
Priority to KR1020057018437A priority patent/KR101054161B1/en
Priority to JP2006509238A priority patent/JP4477628B2/en
Publication of WO2005029756A2 publication Critical patent/WO2005029756A2/en
Publication of WO2005029756A3 publication Critical patent/WO2005029756A3/en

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2387—Stream processing in response to a playback request from an end-user, e.g. for trick-play
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • H04N7/1675—Providing digital key or authorisation information for generation or regeneration of the scrambling sequence
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L63/00—Network architectures or network communication protocols for network security
    • H04L63/04—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks
    • H04L63/0428—Network architectures or network communication protocols for network security for providing a confidential data exchange among entities communicating through data packet networks wherein the data content is protected, e.g. by encrypting or encapsulating the payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/06—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols the encryption apparatus using shift registers or memories for block-wise or stream coding, e.g. DES systems or RC4; Hash functions; Pseudorandom sequence generators
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—Assembling of a multiplex stream, e.g. transport stream, by combining a video stream with other content or additional data, e.g. inserting a URL [Uniform Resource Locator] into a video stream, multiplexing software data into a video stream; Remultiplexing of multiplex streams; Insertion of stuffing bits into the multiplex stream, e.g. to obtain a constant bit-rate; Assembling of a packetised elementary stream
    • H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/238—Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams
    • H04N21/2389—Multiplex stream processing, e.g. multiplex stream encrypting
    • H04N21/23895—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption
    • H04N21/23897—Multiplex stream processing, e.g. multiplex stream encrypting involving multiplex stream encryption by partially encrypting, e.g. encrypting only the ending portion of a movie
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/43—Processing of content or additional data, e.g. demultiplexing additional data from a digital video stream; Elementary client operations, e.g. monitoring of home network or synchronising decoder's clock; Client middleware
    • H04N21/436—Interfacing a local distribution network, e.g. communicating with another STB or one or more peripheral devices inside the home
    • H04N21/43607—Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L2209/00—Additional information or applications relating to cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
    • H04L2209/60—Digital content management, e.g. content distribution

Definitions

  • the present invention relates generally to encrypted multimedia streams.
  • Multimedia streams that are sought to be protected can be encrypted at the transmitter (colloquially referred to as the "head end") with keys in a way that receiving television set-top boxes (STBs) that have complementary keys can decrypt the content for viewing.
  • head end television set-top boxes
  • CA head end conditional access
  • the legacy CA components that are made by the incumbent providers can be programmed by the incumbent providers to detect that the above-mentioned process is ongoing. Consequently, the legacy components might be programmed by the incumbents to defeat the process and, thus, to maintain a de facto monopoly. Having recognized this possibility, the solution below is provided.
  • a method for multimedia transmission includes generating a copy of a multimedia stream to render first and second clear streams having identical predetermined portions.
  • the method also includes sending the first clear stream to a first conditional access (CA) component, which can be a legacy component provided by an incumbent, to encrypt the entire first clear stream to render a completely encrypted stream without the legacy component knowing about the second clear stream.
  • CA conditional access
  • Encrypted versions of the predetermined portions are obtained from the completely encrypted stream.
  • the second clear stream is used to encrypt the predetermined portions using a second CA component to render a partially encrypted stream.
  • the method then contemplates inserting the encrypted predete ⁇ nined portions obtained from the completely encrypted stream into the partially encrypted stream for transmission thereof.
  • the partially encrypted stream with two encrypted versions of each critical packet is sent to plural set-top boxes over cable.
  • the partially encrypted stream can be wirelessly broadcast to plural receivers. re era y, e me o inc u es e ermining oca io i e pre e erm ne por ons us ng corresponding offsets from at least one packet identifier (PID).
  • PID packet identifier
  • the offsets can be in integral numbers of packets from at least one PID.
  • the offsets are used for identifying the locations of the encrypted predetermined portions in the completely encrypted stream for obtaining them and inserting them into the partially encrypted stream, e.g., adjacent to the predetermined portions that were generated by the second CA component.
  • a system for dual partial encryption of a digital data stream includes means for copying the stream to render first and second streams, and first conditional access (CA) means for encrypting only critical portions of the first sfream to render a partially encrypted sfream.
  • Legacy CA means encrypt the entire second stream to render a substantially fully encrypted stream.
  • Means are provided for combining only critical portions from the fully encrypted stream with the partially encrypted stream.
  • a system for use in a digital stream transmitter head end having a legacy conditional access (CA) device includes a system CA device that encrypts at least predetermined portions, and preferably only the predetermined portions, of a first version of a stream.
  • a reconstitution component combines, into a sfream such as the first version of the sfream, the predetermined portions from the system CA device with the predetermined portions obtained from a full encryption of a second version of the stream generated by the legacy CA device.
  • Figure 1 is an architectural block diagram; and Figure 2 is a flow chart of the present logic.
  • j_ j-_iAi ⁇ _j-.jL. uj_.& ⁇ _. _ . - j _, . __ _ _.
  • a system is shown, generally designated 10, that includes a source 12 of digital data streams, such as multimedia streams.
  • the streams are sent to a critical packet locator and offset detector 14 which determines which packets in the stream are "critical".
  • the critical packet locator and offset detector 14 also determines the offset (in integer numbers of packets from one or more packet identifiers (PID)) of each critical packet from a reference packet, e.g., the start of frame packet.
  • PID packet identifiers
  • the above-referenced patent application discusses critical packet selection. For clarity and completeness, critical packets may be information frames ("I-frames") in . MPEG streams, or packetized elementary sfream (PES) headers, or "action zones" of video, or other key packets that contain information which is essential to the successful recovery of picture and/or audio data.
  • packets containing references to program clock references (PCR) in the picture data are never designated as "critical" packets.
  • the offsets of the critical packets are stored in a critical packet offset table 16 or other data structure.
  • the stream is sent from the locator 14 to a sfream copier 18 that makes a copy of the data stream. It is to be understood that the stream could be copied before critical packets and their offsets are identified.
  • one version of the stream is sent to a legacy conditional access (CA) device 20.
  • CA conditional access
  • the legacy CA device 20 can be considered to be a device provided by an incumbent that can process the sfream by, e.g., encoding the sfream with encryption keys, in accordance with the incumbent's proprietary CA scheme.
  • the legacy CA device 20 completely encrypts the stream in accordance with conventional incumbent CA principles to render a fully encrypted stream.
  • a version of the stream is sent from the stream copier to a buffer, preferably a circular first in first out (FIFO) buffer 22.
  • the length of the buffer 22 should be of sufficient length (potentially a fixed length) to account for the delay caused by the processing time of the . . e . buffer 22 may be established in increments of frame/picture or sequence/GOP for management purposes.
  • Figure 1 shows that a secondary CA and reconstitution device 24 receives the clear stream from the FIFO buffer and the fully encrypted sfream from the legacy CA device 20.
  • the secondary CA and reconstitution device 24 includes a CA component, which encrypts only the critical packets in the clear sfream received from the buffer 22, leaving the remaining portions of the stream unencrypted to render a partially encrypted stream.
  • the secondary CA device 24 uses encryption keys that are different from those used by the legacy CA device 20. If desired, the pass through the secondary CA device 24 may slave to a new PCR value output by the legacy CA device 20, with the resulting corresponding value generated by the secondary CA device 24 differing by a fixed offset.
  • the secondary CA and reconstitution device 24 includes a reconstitution component, which copies or strips or otherwise obtains only the now-encrypted critical packets from the frilly encrypted sfream received from the legacy CA device 20 and inserts the packets into the partially encrypted sfream in accordance with principles below.
  • the partially encrypted stream, now with two encrypted versions of each critical packet can be transmitted by a transmission system 26 over, e.g., cable, or terrestrial broadcast, or satellite broadcast. It is to be understood that the functions of the secondary CA and reconstitution device 24 can be undertaken by separate components.
  • a first clear version of the sfream is sent to the legacy CA device 20 at block 34.
  • the legacy CA device 20 fully encrypts the stream in accordance with incumbent CA principles.
  • a second clear version of the stream is buffered at block 38 and then partially encrypted at block 40 by the secondary CA device 24.
  • the secondary CA device 24 encrypts only the critical packets Block 42 represents the reconstitution function
  • the encrypted critical packets from the legacy CA device 20 are obtained by accessing the critical packet offset table 16, obtaining the offsets, and counting through the fully encrypted stream using the offsets from the reference PID oi PIDs.
  • the encrypted packet at that location is obtained by, e.g., copying the packet from the sfream.
  • the c ⁇ tical packets are then inserted into the partially encrypted stream immediately next to the corresponding preexisting critical packets in the stream that were generated by the secondary CA device 24.
  • the partially encrypted stream with two encrypted versions of each critical packet, one from the legacy CA device 20 and one from the secondary CA device 24, is transmitted at block 44. While the particular SYSTEM AND METHOD FOR PARTIALLY ENCRYPTED MULTIMEDIA STREAM as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and is thus representative of the subject matter which is broadly contemplated by the present invention.
  • the secondary CA device 24 could completely encrypt the stream, and the critical packets from the fully encrypted versions from the legacy and secondary CA devices could be copied and inserted into a third clear version of the sfream from which the unencrypted critical packets have been removed.
  • the scope of the present invention thus fully encompasses other embodiments which _ may become o vious o ose s i e m e ar , an a e scope o e presen inven ion is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean "one and only one" unless explicitly so stated, but rather "one or more".

Abstract

A multimedia stream head end includes a legacy conditional access (CA) device (20) that fully encrypts the stream using legacy keys. A copy of the stream is sent to a secondary CA device (24) that encrypts only critical packets in the stream using secondary keys to render a partially encrypted stream. The critical packets in the fully encrypted stream from the legacy CA device (20) are obtained and inserted next to the corresponding critical packets in the partially encrypted stream. Thus, only critical packets are encrypted, with encrypted versions being generated by both the legacy CA (20) and secondary CA (24) without the legacy CA (20) knowing which of the packets that it encrypts are 'critical'.

Description

SYSTEM AND METHOD FOR PARTIALLY ENCRYPTED MULTIMEDIA STREAM
RELATED APPLICATIONS This application is a continuation-in-part of patent applications docket number SNY- R4646.01 entitled "Critical Packet Partial Encryption" to Unger et al., serial number 10/038,217; patent applications docket number SNY-R4646.02 entitled "Time Division Partial Encryption" to Candelore et al., serial number 10/038,032; docket number SNY-R4646.03 entitled "Elementary Stream Partial Encryption" to Candelore, serial number 10/037,914; docket number SNY- R4646.04 entitled "Partial Encryption and PID Mapping" to Unger et al., serial number 10/037;499; and docket number SNY-R4646.05 entitled "Decoding and Decrypting of Partially Encrypted Information" to Unger et al., serial number 10/037,498 all of which were filed on January 2, 2002 and are hereby incorporated by reference herein; this application is also related to and claims priority benefit of U.S. Provisional patent application serial number 60/429,011, filed November 22, 2002, docket number SNY-505305, entitled "Critical Packet Selection in an Encrypted Transport Stream Through Referenced Offset", to Pedlow; this application is also related to and claims priority benefit of U.S. Provisional patent application serial number 60/409,675, filed September 9, 2002, docket number 50S5152, entitled "Generic PID Remapping for Content Replacement", to Candelore; this application is also related to and claims priority benefit of U.S. Provisional patent application serial number 60/372,870 filed April 16, 2002, entitled "Generic PID Remapping for Content Replacement Applications", to Candelore, docket number 50S5066. This application is also related to U.S. patent applications serial number 10/273,905, filed October 18, 2002 to Candelore et al., entitled "Video Slice and Active Region Based Dual Partial Encryption", docket number SNY-R4854.01; serial number 10/273,903, filed October 18, 2002 to Candelore et al., entitled "Star Pattern Partial Encryption", docket number SNY-S5064.01; serial number 10/274,084, filed October 18, 2002 to Candelore et al., entitled ""Slice ask"ahd"MoatWttέM'Partial Encryption", and docket number SNΫ --.^υω.ϋi; smal number 10/274,019, filed October 18, 2002 to Candelore et al., entitled "Video Scene Change Detection", docket number SNY-S5162.01. Each of the above applications are hereby incorporated by reference herein.
I. Field of the Invention The present invention relates generally to encrypted multimedia streams.
π. Background of the Invention Multimedia streams that are sought to be protected (e.g., pay-per-view sporting events, movies, and the like) can be encrypted at the transmitter (colloquially referred to as the "head end") with keys in a way that receiving television set-top boxes (STBs) that have complementary keys can decrypt the content for viewing. Accordingly, cable service providers must use head end conditional access (CA) devices that encrypt multimedia streams in accordance with the capabilities of the set-top boxes of the viewers. Many of these capabilities, including decryption capabilities, are proprietary to the makers of the set-top boxes. It happens that only a very few "incumbent" companies sell most of the set-top boxes. Accordingly, competitors seeking to enter the cable television set-top box market must license the , proprietary keys from the incumbents, often at high prices. This reduces competition. A sfraightforward alternative way to permit competitive STB makers to enter the market without paying licensing fees to the incumbents would be to encourage the cable service providers, at their head ends, to completely encrypt each stream with as many CA devices (using respective sets of keys) as there are set-top box providers. This, however, would plainly undesirably multiply the amount of bandwidth necessary to carry a program. Accordingly, Sony has developed an encryption scheme whereby only "critical" portions, such as I-frames or headers, of a stream are encrypted, with the remainder of the stream being sent in the clear but being useless without being '" a e to' e' rypt t e c t 'ca -' ons. n t s way, on y t e critica portions need be duplicated in encrypted form, not the entire stream. With more specificity, only the critical portions are encrypted both by the existing ("legacy") CA devices using the incumbents' keys and by a secondary conditional access process using a competitor's keys. Published U.S. patent application serial no. 10/038,217, filed January 2, 2002 and incorporated herein by reference, discloses such a scheme. As understood herein, the legacy CA components that are made by the incumbent providers can be programmed by the incumbent providers to detect that the above-mentioned process is ongoing. Consequently, the legacy components might be programmed by the incumbents to defeat the process and, thus, to maintain a de facto monopoly. Having recognized this possibility, the solution below is provided.
SUMMARY OF THE INVENTION A method for multimedia transmission includes generating a copy of a multimedia stream to render first and second clear streams having identical predetermined portions. The method also includes sending the first clear stream to a first conditional access (CA) component, which can be a legacy component provided by an incumbent, to encrypt the entire first clear stream to render a completely encrypted stream without the legacy component knowing about the second clear stream. Encrypted versions of the predetermined portions are obtained from the completely encrypted stream. The second clear stream is used to encrypt the predetermined portions using a second CA component to render a partially encrypted stream. The method then contemplates inserting the encrypted predeteπnined portions obtained from the completely encrypted stream into the partially encrypted stream for transmission thereof. In a preferred embodiment, the partially encrypted stream with two encrypted versions of each critical packet is sent to plural set-top boxes over cable. Or, the partially encrypted stream can be wirelessly broadcast to plural receivers. re era y, e me o inc u es e ermining oca io i e pre e erm ne por ons us ng corresponding offsets from at least one packet identifier (PID). The offsets can be in integral numbers of packets from at least one PID. In a preferred embodiment, the offsets are used for identifying the locations of the encrypted predetermined portions in the completely encrypted stream for obtaining them and inserting them into the partially encrypted stream, e.g., adjacent to the predetermined portions that were generated by the second CA component. In another aspect, a system for dual partial encryption of a digital data stream includes means for copying the stream to render first and second streams, and first conditional access (CA) means for encrypting only critical portions of the first sfream to render a partially encrypted sfream. Legacy CA means encrypt the entire second stream to render a substantially fully encrypted stream.' Means are provided for combining only critical portions from the fully encrypted stream with the partially encrypted stream. hi still another aspect, a system for use in a digital stream transmitter head end having a legacy conditional access (CA) device includes a system CA device that encrypts at least predetermined portions, and preferably only the predetermined portions, of a first version of a stream. A reconstitution component combines, into a sfream such as the first version of the sfream, the predetermined portions from the system CA device with the predetermined portions obtained from a full encryption of a second version of the stream generated by the legacy CA device. The details of the present invention, both as to its structure and operation, can best be understood in reference to the accompanying drawings, in which like reference numerals refer to like parts, and in which:
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is an architectural block diagram; and Figure 2 is a flow chart of the present logic. j_»j-_iAiι_j-.jL. uj_.&<_. _ . - j _, . __ _ _. Referring initially to Figure 1, a system is shown, generally designated 10, that includes a source 12 of digital data streams, such as multimedia streams. The streams are sent to a critical packet locator and offset detector 14 which determines which packets in the stream are "critical". The critical packet locator and offset detector 14 also determines the offset (in integer numbers of packets from one or more packet identifiers (PID)) of each critical packet from a reference packet, e.g., the start of frame packet. The above-referenced patent application discusses critical packet selection. For clarity and completeness, critical packets may be information frames ("I-frames") in . MPEG streams, or packetized elementary sfream (PES) headers, or "action zones" of video, or other key packets that contain information which is essential to the successful recovery of picture and/or audio data. Preferably, packets containing references to program clock references (PCR) in the picture data (including presentation timestamp (PTS) and decoding timestamp (DTS) information) are never designated as "critical" packets. As shown in Figure 1, the offsets of the critical packets are stored in a critical packet offset table 16 or other data structure. Also, the stream is sent from the locator 14 to a sfream copier 18 that makes a copy of the data stream. It is to be understood that the stream could be copied before critical packets and their offsets are identified. As can be appreciated in reference to Figure 1, one version of the stream is sent to a legacy conditional access (CA) device 20. The legacy CA device 20 can be considered to be a device provided by an incumbent that can process the sfream by, e.g., encoding the sfream with encryption keys, in accordance with the incumbent's proprietary CA scheme. The legacy CA device 20 completely encrypts the stream in accordance with conventional incumbent CA principles to render a fully encrypted stream. Additionally, a version of the stream is sent from the stream copier to a buffer, preferably a circular first in first out (FIFO) buffer 22. The length of the buffer 22 should be of sufficient length (potentially a fixed length) to account for the delay caused by the processing time of the . . e . buffer 22 may be established in increments of frame/picture or sequence/GOP for management purposes. Figure 1 shows that a secondary CA and reconstitution device 24 receives the clear stream from the FIFO buffer and the fully encrypted sfream from the legacy CA device 20. The secondary CA and reconstitution device 24 includes a CA component, which encrypts only the critical packets in the clear sfream received from the buffer 22, leaving the remaining portions of the stream unencrypted to render a partially encrypted stream. The secondary CA device 24 uses encryption keys that are different from those used by the legacy CA device 20. If desired, the pass through the secondary CA device 24 may slave to a new PCR value output by the legacy CA device 20, with the resulting corresponding value generated by the secondary CA device 24 differing by a fixed offset. Also, the secondary CA and reconstitution device 24 includes a reconstitution component, which copies or strips or otherwise obtains only the now-encrypted critical packets from the frilly encrypted sfream received from the legacy CA device 20 and inserts the packets into the partially encrypted sfream in accordance with principles below. The partially encrypted stream, now with two encrypted versions of each critical packet (one generated by the legacy CA device 20 and one generated by the secondary CA device 24) can be transmitted by a transmission system 26 over, e.g., cable, or terrestrial broadcast, or satellite broadcast. It is to be understood that the functions of the secondary CA and reconstitution device 24 can be undertaken by separate components. It is to be further understood that the functions of the components 16, 18, 22, and 24 can be executed by a single secondary CA computing device or system or by separate devices/systems, and that the principles set forth herein apply to an overall system 10 that can have plural secondary CA systems. The logic that is implemented by the system 10 shown in Figure 1 can be seen in Figure 2. Commencing at block 28, critical packets in the stream are identified, along with their offsets from a preαeiermme pac e or pac e s, in acc r ance wi pr ncip es se or a ove e o sets are stored (e.g., in the offset table 16) at block 30, and the sfream is copied at block 32 by the stream copier 18. A first clear version of the sfream is sent to the legacy CA device 20 at block 34. At block 36, the legacy CA device 20 fully encrypts the stream in accordance with incumbent CA principles. In parallel, a second clear version of the stream is buffered at block 38 and then partially encrypted at block 40 by the secondary CA device 24. As mentioned above, the secondary CA device 24 encrypts only the critical packets Block 42 represents the reconstitution function The encrypted critical packets from the legacy CA device 20 are obtained by accessing the critical packet offset table 16, obtaining the offsets, and counting through the fully encrypted stream using the offsets from the reference PID oi PIDs. At each indicated critical packet offset location, the encrypted packet at that location is obtained by, e.g., copying the packet from the sfream. The cπtical packets are then inserted into the partially encrypted stream immediately next to the corresponding preexisting critical packets in the stream that were generated by the secondary CA device 24. The partially encrypted stream with two encrypted versions of each critical packet, one from the legacy CA device 20 and one from the secondary CA device 24, is transmitted at block 44. While the particular SYSTEM AND METHOD FOR PARTIALLY ENCRYPTED MULTIMEDIA STREAM as herein shown and described in detail is fully capable of attaining the above-described objects of the invention, it is to be understood that it is the presently preferred embodiment of the present invention and is thus representative of the subject matter which is broadly contemplated by the present invention. For example, in a less elegant solution, the secondary CA device 24 could completely encrypt the stream, and the critical packets from the fully encrypted versions from the legacy and secondary CA devices could be copied and inserted into a third clear version of the sfream from which the unencrypted critical packets have been removed. The scope of the present invention thus fully encompasses other embodiments which _ may become o vious o ose s i e m e ar , an a e scope o e presen inven ion is accordingly to be limited by nothing other than the appended claims, in which reference to an element in the singular is not intended to mean "one and only one" unless explicitly so stated, but rather "one or more". All structural and functional equivalents to the elements of the above- described preferred embodiment that are known or later come to be known to those of ordinary skill in the art are expressly incorporated herein by reference and are intended to be encompassed by the present claims. Moreover, it is not necessary for a device or method to address each and every problem sought to be solved by the present invention, for it to be encompassed by the present- claims. Furthermore, no element, component, or method step in the present disclosure is intended to be dedicated to the public regardless of whether the element, component, or method step is explicitly recited in the claims. No claim element herein is to be construed under the provisions of 35 U.S.C. § 112, sixth paragraph, unless the element is expressly recited using the phrase "means for" or, in the case of a method claim, the element is recited as a "step" instead of an "act". Absent express definitions herein, claim terms are to be given all ordinary and accustomed meanings that are not irreconciliable with the present specification and file history.

Claims

. _. _ _ 1. A method for multimedia transmission, comprising: generating a copy of a multimedia stream to render first and second clear streams having identical predetermined portions; sending the first clear sfream to a first conditional access (CA) component (20) to encrypt the entire first clear stream to render a completely encrypted sfream; obtaining encrypted versions of the predetermined portions from the completely encrypted stream; using the second clear stream, encrypting the predetermined portions using a second CA component (24) to render a partially encrypted sfream; and inserting the encrypted predetermined portions obtained from the completely encrypted stream into the partially encrypted stream for transmission thereof.
2. The method of Claim 1 , comprising transmitting the partially encrypted sfream to plural set-top boxes over cable.
3. The method of Claim 1 , comprising wirelessly broadcasting the partially encrypted stream to plural receivers.
4. The method of Claim 1 , wherein the first CA component (20) is a legacy component provided by an incumbent.
5. The method of Claim 1 , comprising determining locations of the predetermined portions at least in one of the sfreams using corresponding offsets from at least one packet identifier (PID). o. ie me o o aim _>, w erein e o se s are in in egra num ers o pac ets from at least one PID.
7. The method of Claim 5, wherein the offsets are used for identifying the locations of the encrypted predetermined portions in the completely encrypted stream for obtaining them and inserting them into the partially encrypted sfream.
8. The method of Claim 1, wherein the encrypted predetermined portions obtained from the completely encrypted stream are inserted adjacent to the predetermined portions encrypted using the second CA component (24) in the partially encrypted sfream.
9. A system for dual partial encryption of a digital data stream, comprising: means (18) for copying the stream to render first and second streams; first conditional access (CA) means (24) for encrypting only critical portions of the first sfream to render a partially encrypted stream; legacy CA means (20) for encrypting the entire second sfream to render a substantially fully encrypted stream; and means (24) for combining only critical portions from the fully encrypted sfream with the partially encrypted sfream.
. 10. The system of Claim 9, further comprising means (26) for transmitting the partially encrypted sfream.
11. The system of Claim 9, comprising means (26) for transmitting the partially encrypted stream to plural set-top boxes over cable.
. ι . e sys em o aim , comprising means or wire ess y roa cas ing e partially encrypted stream to plural receivers.
13. The system of Claim 9, comprising means (14) for determining locations of the critical portions at least in one of the streams using corresponding offsets from at least one packet identifier (PID).
14. The system of Claim 13, wherein the offsets are in integral numbers of packets from at least one PID.
15. The system of Claim 13 , wherein the offsets are used for identifying the locations of the critical portions from the fully encrypted sfream.
• 16. The system of Claim 9, wherein the critical portions generated by the legacy CA means (20) are adjacent, in the partially encrypted stream, to critical portions generated by the first CA means (24).
17. A system (10) for use in a digital sfream transmitter head end having a legacy conditional access (CA) device (20), comprising: at least a system CA device (24) encrypting at least predetermined portions of a first version of a stream; and a reconstitution component (24) combining, into a stream, the predetermined portions from the system CA device (24) and the predetermined portions obtained from a full encryption of a second version of the stream, the full encryption being generated by the legacy CA device (20).
PCT/US2004/006987 2003-03-31 2004-03-08 System and method for partially encrypted multimedia stream WO2005029756A2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
CA2517433A CA2517433C (en) 2003-03-31 2004-03-08 System and method for partially encrypted multimedia stream
EP04785864.2A EP1609313B1 (en) 2003-03-31 2004-03-08 System and method for partially encrypted multimedia stream
KR1020057018437A KR101054161B1 (en) 2003-03-31 2004-03-08 System and method for partially encrypted multimedia stream
JP2006509238A JP4477628B2 (en) 2003-03-31 2004-03-08 Multimedia transmission method and apparatus

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/403,834 2003-03-31
US10/403,834 US7215770B2 (en) 2002-01-02 2003-03-31 System and method for partially encrypted multimedia stream

Publications (2)

Publication Number Publication Date
WO2005029756A2 true WO2005029756A2 (en) 2005-03-31
WO2005029756A3 WO2005029756A3 (en) 2005-09-22

Family

ID=34375137

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2004/006987 WO2005029756A2 (en) 2003-03-31 2004-03-08 System and method for partially encrypted multimedia stream

Country Status (7)

Country Link
US (2) US7215770B2 (en)
EP (1) EP1609313B1 (en)
JP (1) JP4477628B2 (en)
KR (1) KR101054161B1 (en)
CN (2) CN102045590B (en)
CA (1) CA2517433C (en)
WO (1) WO2005029756A2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2505931C2 (en) * 2008-06-30 2014-01-27 Томсон Лайсенсинг Methods and apparatus for selective data encryption
US8804591B2 (en) 2009-09-18 2014-08-12 Interdigital Patent Holdings, Inc. Method and apparatus for multicast mobility

Families Citing this family (60)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6697489B1 (en) * 1999-03-30 2004-02-24 Sony Corporation Method and apparatus for securing control words
US7730300B2 (en) 1999-03-30 2010-06-01 Sony Corporation Method and apparatus for protecting the transfer of data
US7039614B1 (en) 1999-11-09 2006-05-02 Sony Corporation Method for simulcrypting scrambled data to a plurality of conditional access devices
US7225164B1 (en) * 2000-02-15 2007-05-29 Sony Corporation Method and apparatus for implementing revocation in broadcast networks
US7018795B2 (en) * 2001-03-23 2006-03-28 Fuji Photo Film Co., Ltd. Hybridization probe and target nucleic acid detecting kit, target nucleic acid detecting apparatus and target nucleic acid detecting method using the same
US7747853B2 (en) * 2001-06-06 2010-06-29 Sony Corporation IP delivery of secure digital content
US7895616B2 (en) 2001-06-06 2011-02-22 Sony Corporation Reconstitution of program streams split across multiple packet identifiers
US7127619B2 (en) * 2001-06-06 2006-10-24 Sony Corporation Decoding and decryption of partially encrypted information
WO2002101490A2 (en) * 2001-06-07 2002-12-19 Contentguard Holdings, Inc. Cryptographic trust zones in digital rights management
US7765567B2 (en) 2002-01-02 2010-07-27 Sony Corporation Content replacement by PID mapping
US7292690B2 (en) * 2002-01-02 2007-11-06 Sony Corporation Video scene change detection
US7155012B2 (en) * 2002-01-02 2006-12-26 Sony Corporation Slice mask and moat pattern partial encryption
US7823174B2 (en) 2002-01-02 2010-10-26 Sony Corporation Macro-block based content replacement by PID mapping
US7302059B2 (en) * 2002-01-02 2007-11-27 Sony Corporation Star pattern partial encryption
US7215770B2 (en) 2002-01-02 2007-05-08 Sony Corporation System and method for partially encrypted multimedia stream
US7346055B2 (en) * 2002-08-29 2008-03-18 Broadcom Corporation Method and system for co-relating transport packets on different channels using a unique packet identifier
US8818896B2 (en) 2002-09-09 2014-08-26 Sony Corporation Selective encryption with coverage encryption
US7724907B2 (en) * 2002-11-05 2010-05-25 Sony Corporation Mechanism for protecting the transfer of digital content
US8572408B2 (en) * 2002-11-05 2013-10-29 Sony Corporation Digital rights management of a digital device
US8667525B2 (en) 2002-12-13 2014-03-04 Sony Corporation Targeted advertisement selection from a digital stream
US8645988B2 (en) 2002-12-13 2014-02-04 Sony Corporation Content personalization for digital content
US7801820B2 (en) * 2003-01-13 2010-09-21 Sony Corporation Real-time delivery of license for previously stored encrypted content
SG129240A1 (en) * 2003-01-23 2007-02-26 Agency Science Tech & Res Biodegradable copolymer and nucleic acid delivery system
US7292692B2 (en) * 2003-03-25 2007-11-06 Sony Corporation Content scrambling with minimal impact on legacy devices
US7853980B2 (en) 2003-10-31 2010-12-14 Sony Corporation Bi-directional indices for trick mode video-on-demand
US7263187B2 (en) * 2003-10-31 2007-08-28 Sony Corporation Batch mode session-based encryption of video on demand content
US7519274B2 (en) 2003-12-08 2009-04-14 Divx, Inc. File format for multiple track digital data
US8472792B2 (en) 2003-12-08 2013-06-25 Divx, Llc Multimedia distribution system
US8098817B2 (en) 2003-12-22 2012-01-17 Intel Corporation Methods and apparatus for mixing encrypted data with unencrypted data
KR100630680B1 (en) * 2004-03-19 2006-10-02 삼성전자주식회사 Non-volatile Memory Device with Asymmetrical Gate Dielectric Layer and Manufacturing Method thereof
JP4235824B2 (en) * 2004-09-09 2009-03-11 村田機械株式会社 Encryption device
US7895617B2 (en) 2004-12-15 2011-02-22 Sony Corporation Content substitution editor
US8041190B2 (en) * 2004-12-15 2011-10-18 Sony Corporation System and method for the creation, synchronization and delivery of alternate content
US20080015999A1 (en) * 2005-02-04 2008-01-17 Widevine Technologies, Inc. Securely ingesting encrypted content into content servers
US8185921B2 (en) * 2006-02-28 2012-05-22 Sony Corporation Parental control of displayed content using closed captioning
WO2007106844A2 (en) 2006-03-14 2007-09-20 Divx, Inc. Federated digital rights management scheme including trusted systems
US9277295B2 (en) * 2006-06-16 2016-03-01 Cisco Technology, Inc. Securing media content using interchangeable encryption key
US9137480B2 (en) * 2006-06-30 2015-09-15 Cisco Technology, Inc. Secure escrow and recovery of media device content keys
CN101636726B (en) 2007-01-05 2013-10-30 Divx有限责任公司 Video distribution system including progressive playback
US8108680B2 (en) * 2007-07-23 2012-01-31 Murray Mark R Preventing unauthorized poaching of set top box assets
US8385545B2 (en) * 2007-07-27 2013-02-26 Howard G. Pinder Secure content key distribution using multiple distinct methods
US7949133B2 (en) * 2007-09-26 2011-05-24 Pinder Howard G Controlled cryptoperiod timing to reduce decoder processing load
EP2223232A4 (en) 2007-11-16 2015-02-25 Sonic Ip Inc Hierarchical and reduced index structures for multimedia files
JP5205075B2 (en) * 2008-02-13 2013-06-05 パナソニック株式会社 Encryption processing method, encryption processing device, decryption processing method, and decryption processing device
JP5408608B2 (en) * 2009-03-02 2014-02-05 公立大学法人大阪市立大学 Cryptographic traffic identification device and cryptographic traffic identification system including the same
US20100278338A1 (en) * 2009-05-04 2010-11-04 Mediatek Singapore Pte. Ltd. Coding device and method with reconfigurable and scalable encryption/decryption modules
CN101562813B (en) 2009-05-12 2012-01-11 中兴通讯股份有限公司 Method for implementing real-time data service, real-time data service system and mobile terminal
CA2782825C (en) 2009-12-04 2016-04-26 Divx, Llc Elementary bitstream cryptographic material transport systems and methods
US8914534B2 (en) 2011-01-05 2014-12-16 Sonic Ip, Inc. Systems and methods for adaptive bitrate streaming of media stored in matroska container files using hypertext transfer protocol
US9467708B2 (en) 2011-08-30 2016-10-11 Sonic Ip, Inc. Selection of resolutions for seamless resolution switching of multimedia content
US8787570B2 (en) 2011-08-31 2014-07-22 Sonic Ip, Inc. Systems and methods for automatically genenrating top level index files
US8909922B2 (en) 2011-09-01 2014-12-09 Sonic Ip, Inc. Systems and methods for playing back alternative streams of protected content protected using common cryptographic information
US9008308B2 (en) * 2012-02-08 2015-04-14 Vixs Systems, Inc Container agnostic decryption device and methods for use therewith
US9559845B2 (en) 2012-03-01 2017-01-31 Ologn Technologies Ag Systems, methods and apparatuses for the secure transmission of media content
CA2865548C (en) 2012-03-01 2021-03-02 Ologn Technologies Ag Systems, methods and apparatuses for the secure transmission and restricted use of media content
US8812839B2 (en) * 2012-07-31 2014-08-19 Adobe Systems Incorporated System and method for local generation of streaming content with a hint track
US9191457B2 (en) 2012-12-31 2015-11-17 Sonic Ip, Inc. Systems, methods, and media for controlling delivery of content
US9838686B2 (en) * 2013-07-12 2017-12-05 Intel Corporation Techniques for inclusion of thumbnail images in compressed video data
WO2016112112A1 (en) 2015-01-06 2016-07-14 Sonic Ip, Inc. Systems and methods for encoding and sharing content between devices
CN108880812B (en) * 2017-05-09 2022-08-09 北京京东尚科信息技术有限公司 Method and system for data encryption

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3821702A (en) 1971-05-22 1974-06-28 Nissan Motor Lighting system for controlling lights of motor vehicle to glow in a reduced luminous intensity during the nighttime
US20020196939A1 (en) 2001-06-06 2002-12-26 Unger Robert Allan Decoding and decryption of partially encrypted information

Family Cites Families (303)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5870474A (en) * 1995-12-04 1999-02-09 Scientific-Atlanta, Inc. Method and apparatus for providing conditional access in connection-oriented, interactive networks with a multiplicity of service providers
US3852519A (en) 1972-10-20 1974-12-03 Optical Systems Corp Video and audio encoding/decoding system employing suppressed carrier modulation
GB2073534B (en) 1980-04-02 1984-04-04 Sony Corp Error concealment in digital television signals
GB2084432A (en) 1980-09-18 1982-04-07 Sony Corp Error concealment in digital television signals
US4521853A (en) 1982-06-30 1985-06-04 Texas Instruments Incorporated Secure microprocessor/microcomputer with secured memory
US4785361A (en) 1982-11-08 1988-11-15 Vault Corporation Method and apparatus for frustrating the unauthorized copying of recorded data
US4634808A (en) 1984-03-15 1987-01-06 M/A-Com Government Systems, Inc. Descrambler subscriber key production system utilizing key seeds stored in descrambler
US4712238A (en) 1984-06-08 1987-12-08 M/A-Com Government Systems, Inc. Selective-subscription descrambling
JPS6120442A (en) 1984-07-09 1986-01-29 Toshiba Corp Chargeable broadcasting system
JPH0746864B2 (en) 1984-08-22 1995-05-17 ソニー株式会社 High efficiency encoder
US4887296A (en) 1984-10-26 1989-12-12 Ricoh Co., Ltd. Cryptographic system for direct broadcast satellite system
CA1251555A (en) 1984-12-19 1989-03-21 Tetsujiro Kondo High efficiency technique for coding a digital video signal
JPH0793724B2 (en) 1984-12-21 1995-10-09 ソニー株式会社 High efficiency coding apparatus and coding method for television signal
EP0200310B1 (en) 1985-05-01 1993-08-11 General Instrument Corporation Direct broadcast satellite signal transmission system
JP2670259B2 (en) 1985-11-29 1997-10-29 ソニー株式会社 High efficiency coding device
JPH0746862B2 (en) 1985-11-30 1995-05-17 ソニー株式会社 Frame dropping compression encoding and decoding method
JP2612557B2 (en) 1985-12-18 1997-05-21 ソニー株式会社 Data transmission receiving system and data decoding device
JPS62231569A (en) 1986-03-31 1987-10-12 Fuji Photo Film Co Ltd Quantizing method for estimated error
US4944006A (en) 1987-03-12 1990-07-24 Zenith Electronics Corporation Secure data packet transmission system and method
JP2508439B2 (en) 1987-05-29 1996-06-19 ソニー株式会社 High efficiency encoder
ATE74219T1 (en) 1987-06-02 1992-04-15 Siemens Ag METHOD FOR DETERMINING MOTION VECTOR FIELDS FROM DIGITAL IMAGE SEQUENCES.
US4881263A (en) 1987-09-25 1989-11-14 Digital Equipment Corporation Apparatus and method for secure transmission of data over an unsecure transmission channel
US5122873A (en) 1987-10-05 1992-06-16 Intel Corporation Method and apparatus for selectively encoding and decoding a digital motion video signal at multiple resolution levels
JP2629238B2 (en) 1988-02-05 1997-07-09 ソニー株式会社 Decoding device and decoding method
US4995080A (en) 1988-08-04 1991-02-19 Zenith Electronics Corporation Television signal scrambling system and method
US5247575A (en) 1988-08-16 1993-09-21 Sprague Peter J Information distribution system
US4953023A (en) 1988-09-29 1990-08-28 Sony Corporation Coding apparatus for encoding and compressing video data
JP2900385B2 (en) 1988-12-16 1999-06-02 ソニー株式会社 Framing circuit and method
US5144662A (en) 1989-02-08 1992-09-01 U.S. Philips Corporation Public communication system comprising distributed stations, and station and sub-station for use in such a communication system
JP3018366B2 (en) 1989-02-08 2000-03-13 ソニー株式会社 Video signal processing circuit
US4989245A (en) 1989-03-06 1991-01-29 General Instrument Corporation Controlled authorization of descrambling of scrambled programs broadcast between different jurisdictions
US5151782A (en) 1989-05-17 1992-09-29 Reiss Media Enterprises Control system for satellite delivered pay-per-view television system
US5208816A (en) 1989-08-18 1993-05-04 At&T Bell Laboratories Generalized viterbi decoding algorithms
US6519693B1 (en) * 1989-08-23 2003-02-11 Delta Beta, Pty, Ltd. Method and system of program transmission optimization using a redundant transmission sequence
JPH03141752A (en) 1989-10-27 1991-06-17 Hitachi Ltd Picture signal transmitting method
US5237610A (en) 1990-02-01 1993-08-17 Scientific-Atlanta, Inc. Independent external security module for a digitally upgradeable television signal decoder
US5682425A (en) * 1990-04-23 1997-10-28 Canon Kabushiki Kaisha Information signal transmission system
JPH0474063A (en) 1990-07-13 1992-03-09 Matsushita Electric Ind Co Ltd Coding method for picture
US5018197A (en) 1990-07-30 1991-05-21 Zenith Electronics Corporation Secure video decoder system
JP2650472B2 (en) 1990-07-30 1997-09-03 松下電器産業株式会社 Digital signal recording apparatus and digital signal recording method
JP2969867B2 (en) 1990-08-31 1999-11-02 ソニー株式会社 High-efficiency encoder for digital image signals.
GB9019538D0 (en) 1990-09-07 1990-10-24 Philips Electronic Associated Tracking a moving object
US5416651A (en) 1990-10-31 1995-05-16 Sony Corporation Apparatus for magnetically recording digital data
US5144664A (en) 1990-11-16 1992-09-01 General Instrument Corporation Apparatus and method for upgrading terminals to maintain a secure communication network
JP2906671B2 (en) 1990-12-28 1999-06-21 ソニー株式会社 Highly efficient digital video signal encoding apparatus and method
EP0495501B1 (en) 1991-01-17 1998-07-08 Sharp Kabushiki Kaisha Image coding and decoding system using an orthogonal transform and bit allocation method suitable therefore
US5091936A (en) 1991-01-30 1992-02-25 General Instrument Corporation System for communicating television signals or a plurality of digital audio signals in a standard television line allocation
US5138659A (en) 1991-05-02 1992-08-11 General Instrument Corporation Conversion of television signal formats with retention of common control data stream
JPH04358486A (en) 1991-06-04 1992-12-11 Toshiba Corp High efficiency code signal processing unit
JP2766919B2 (en) 1991-06-07 1998-06-18 三菱電機株式会社 Digital signal recording / reproducing device, digital signal recording device, digital signal reproducing device
US5263026A (en) 1991-06-27 1993-11-16 Hughes Aircraft Company Maximum likelihood sequence estimation based equalization within a mobile digital cellular receiver
MY108367A (en) 1991-09-30 1996-09-30 Thomson Consumer Electronics S A Method and apparatus for secure transmisson of video signals.
DE69217150T2 (en) 1991-09-30 1997-07-17 Philips Electronics Nv Motion vector estimation, motion picture coding and storage
JPH05103309A (en) 1991-10-04 1993-04-23 Canon Inc Method and device for transmitting information
US5398078A (en) 1991-10-31 1995-03-14 Kabushiki Kaisha Toshiba Method of detecting a motion vector in an image coding apparatus
US5724091A (en) * 1991-11-25 1998-03-03 Actv, Inc. Compressed digital data interactive program system
US20010013123A1 (en) 1991-11-25 2001-08-09 Freeman Michael J. Customized program creation by splicing server based video, audio, or graphical segments
JP3278881B2 (en) 1991-12-13 2002-04-30 ソニー株式会社 Image signal generator
AU693766B2 (en) 1992-01-08 1998-07-09 Multichannel Communication Sciences, Inc. Multichannel television signal scrambling and descrambling system and method
US6208805B1 (en) 1992-02-07 2001-03-27 Max Abecassis Inhibiting a control function from interfering with a playing of a video
JP3259323B2 (en) 1992-04-13 2002-02-25 ソニー株式会社 De-interleave circuit
US5359694A (en) 1992-07-27 1994-10-25 Teknekron Communications Systems, Inc. Method and apparatus for converting image data
US5438369A (en) 1992-08-17 1995-08-01 Zenith Electronics Corporation Digital data interleaving system with improved error correctability for vertically correlated interference
US5481554A (en) 1992-09-02 1996-01-02 Sony Corporation Data transmission apparatus for transmitting code data
US5414852A (en) 1992-10-30 1995-05-09 International Business Machines Corporation Method for protecting data in a computer system
US5400401A (en) 1992-10-30 1995-03-21 Scientific Atlanta, Inc. System and method for transmitting a plurality of digital services
US5319707A (en) 1992-11-02 1994-06-07 Scientific Atlanta System and method for multiplexing a plurality of digital program services for transmission to remote locations
US5341425A (en) 1992-12-02 1994-08-23 Scientific Atlanta, Inc. Methods and apparatus for uniquely encrypting data at a plurality of data transmission sites for transmission to a reception site
US5726711A (en) 1993-01-13 1998-03-10 Hitachi America, Ltd. Intra-coded video frame data processing methods and apparatus
US5325432A (en) 1993-02-04 1994-06-28 Motorola, Inc. Method for updating encryption key information in communication units
US5416847A (en) 1993-02-12 1995-05-16 The Walt Disney Company Multi-band, digital audio noise filter
US5444491A (en) 1993-02-26 1995-08-22 Massachusetts Institute Of Technology Television system with multiple transmission formats
US5444782A (en) * 1993-03-09 1995-08-22 Uunet Technologies, Inc. Computer network encryption/decryption device
US5444763A (en) 1993-06-17 1995-08-22 Research In Motion Limited Translation and connection device for radio frequency point of sale transaction systems
KR960015357B1 (en) 1993-07-16 1996-11-09 대우전자 주식회사 Communication system of scrambling and descrambling for radio program signal
JP2707950B2 (en) 1993-07-30 1998-02-04 ソニー株式会社 Digital image information processing device
US5381481A (en) 1993-08-04 1995-01-10 Scientific-Atlanta, Inc. Method and apparatus for uniquely encrypting a plurality of services at a transmission site
US5319712A (en) 1993-08-26 1994-06-07 Motorola, Inc. Method and apparatus for providing cryptographic protection of a data stream in a communication system
KR960012931B1 (en) 1993-08-31 1996-09-25 대우전자 주식회사 Channel error concealing method for classified vector quantized video
JP2883265B2 (en) 1993-09-24 1999-04-19 キヤノン株式会社 Image processing device
JP3590996B2 (en) 1993-09-30 2004-11-17 ソニー株式会社 Hierarchical encoding and decoding apparatus for digital image signal
US5663764A (en) 1993-09-30 1997-09-02 Sony Corporation Hierarchical encoding and decoding apparatus for a digital image signal
US5617333A (en) 1993-11-29 1997-04-01 Kokusai Electric Co., Ltd. Method and apparatus for transmission of image data
US5455862A (en) 1993-12-02 1995-10-03 Crest Industries, Inc. Apparatus and method for encrypting communications without exchanging an encryption key
JP3271108B2 (en) 1993-12-03 2002-04-02 ソニー株式会社 Apparatus and method for processing digital image signal
FR2715256B1 (en) 1994-01-19 1996-02-16 France Telecom Procedures for transmitting and receiving conditional access programs managed by the same operator.
EP0669761A3 (en) 1994-02-23 1999-03-03 Hitachi, Ltd. Television signal receiving apparatus incorporating an information retrieving and reproducing apparatus
US5491748A (en) 1994-03-01 1996-02-13 Zenith Electronics Corporation Enhanced security for a cable system
DE69514177T2 (en) 1994-03-18 2000-08-31 Koninkl Philips Electronics Nv SYSTEM FOR AUDIOVISUAL PERFORMANCE
US5420866A (en) 1994-03-29 1995-05-30 Scientific-Atlanta, Inc. Methods for providing conditional access information to decoders in a packet-based multiplexed communications system
FR2718594B1 (en) 1994-04-06 1996-04-26 France Telecom Method for broadcasting programs with progressive conditional access and separating the flow of information.
US5459789A (en) 1994-04-22 1995-10-17 Thomson Consumer Electronics Packet TV program component detector
US5477263A (en) 1994-05-26 1995-12-19 Bell Atlantic Network Services, Inc. Method and apparatus for video on demand with fast forward, reverse and channel pause
US5666293A (en) 1994-05-27 1997-09-09 Bell Atlantic Network Services, Inc. Downloading operating system software through a broadcast channel
US5473692A (en) 1994-09-07 1995-12-05 Intel Corporation Roving software license for a hardware agent
US6185546B1 (en) * 1995-10-04 2001-02-06 Intel Corporation Apparatus and method for providing secured communications
US5539828A (en) 1994-05-31 1996-07-23 Intel Corporation Apparatus and method for providing secured communications
US5606359A (en) 1994-06-30 1997-02-25 Hewlett-Packard Company Video on demand system with multiple data sources configured to provide vcr-like services
US5535276A (en) 1994-11-09 1996-07-09 Bell Atlantic Network Services, Inc. Yaksha, an improved system and method for securing communications using split private key asymmetric cryptography
US5526427A (en) 1994-07-22 1996-06-11 A.C. Nielsen Company Universal broadcast code and multi-level encoded signal monitoring system
US5574787A (en) 1994-07-25 1996-11-12 Ryan; John O. Apparatus and method for comprehensive copy protection for video platforms and unprotected source material
US5539823A (en) 1994-07-27 1996-07-23 General Instrument Corporation Of Delaware Subscription television picture scrambling and descrambling system providing compatibility with different such systems
US5629981A (en) 1994-07-29 1997-05-13 Texas Instruments Incorporated Information management and security system
US5652795A (en) 1994-11-14 1997-07-29 Hughes Electronics Method and apparatus for an adapter card providing conditional access in a communication system
KR0152788B1 (en) * 1994-11-26 1998-10-15 이헌조 Copy protecting method and apparatus of digital image system
KR100332743B1 (en) * 1994-11-26 2002-11-07 엘지전자주식회사 Device and method for preventing illegal copy or unauthorized watching of digital image
US5485577A (en) 1994-12-16 1996-01-16 General Instrument Corporation Of Delaware Method and apparatus for incremental delivery of access rights
US7362775B1 (en) * 1996-07-02 2008-04-22 Wistaria Trading, Inc. Exchange mechanisms for digital information packages with bandwidth securitization, multichannel digital watermarks, and key management
US5590202A (en) 1995-01-18 1996-12-31 Zenith Electronics Corporation Countdown system for conditional access module
US5583863A (en) 1995-01-31 1996-12-10 Bell Atlantic Network Services, Inc. Full service network using asynchronous transfer mode multiplexing
US5999406A (en) 1995-02-23 1999-12-07 Avid Technology, Inc. Dockable electronic equipment container
US5696906A (en) 1995-03-09 1997-12-09 Continental Cablevision, Inc. Telecommunicaion user account management system and method
US6937729B2 (en) * 1995-04-03 2005-08-30 Scientific-Atlanta, Inc. Representing entitlements to service in a conditional access system
US20040136532A1 (en) 1995-04-03 2004-07-15 Pinder Howard G. Partial dual-encrypted stream utilizing program map tables
US8548166B2 (en) * 1995-04-03 2013-10-01 Anthony J. Wasilewski Method for partially encrypting program data
US7224798B2 (en) * 1995-04-03 2007-05-29 Scientific-Atlanta, Inc. Methods and apparatus for providing a partial dual-encrypted stream in a conditional access overlay system
US6424717B1 (en) 1995-04-03 2002-07-23 Scientific-Atlanta, Inc. Encryption devices for use in a conditional access system
US5608448A (en) 1995-04-10 1997-03-04 Lockheed Martin Corporation Hybrid architecture for video on demand server
US5600378A (en) 1995-05-22 1997-02-04 Scientific-Atlanta, Inc. Logical and composite channel mapping in an MPEG network
US5652615A (en) 1995-06-30 1997-07-29 Digital Equipment Corporation Precision broadcast of composite programs including secondary program content such as advertisements
US5583576A (en) 1995-09-11 1996-12-10 Oktv, Inc. Rating-dependent parental lock-out for television reception
US5582470A (en) 1995-09-12 1996-12-10 Silitek Corporation Scanner housing
US5742680A (en) 1995-11-13 1998-04-21 E Star, Inc. Set top box for receiving and decryption and descrambling a plurality of satellite television signals
JP3416007B2 (en) * 1995-12-06 2003-06-16 インターナショナル・ビジネス・マシーンズ・コーポレーション Apparatus and method for screening audiovisual material
US5751280A (en) 1995-12-11 1998-05-12 Silicon Graphics, Inc. System and method for media stream synchronization with a base atom index file and an auxiliary atom index file
FI100563B (en) 1996-01-30 1997-12-31 Nokia Oy Ab Encryption of digital presentation objects during transmission and recording
JPH09214872A (en) 1996-01-30 1997-08-15 Sony Corp Information signal processing unit and information signal processing method
WO1997029416A2 (en) 1996-02-09 1997-08-14 Integrated Technologies Of America, Inc. Access control/crypto system
US6055314A (en) * 1996-03-22 2000-04-25 Microsoft Corporation System and method for secure purchase and delivery of video content programs
US5754658A (en) * 1996-04-19 1998-05-19 Intel Corporation Adaptive encryption to avoid processor oversaturation
US5751813A (en) 1996-04-29 1998-05-12 Motorola, Inc. Use of an encryption server for encrypting messages
US5894320A (en) * 1996-05-29 1999-04-13 General Instrument Corporation Multi-channel television system with viewer-selectable video and audio
US5838873A (en) 1996-05-31 1998-11-17 Thomson Consumer Electronics, Inc. Packetized data formats for digital data storage media
US6065050A (en) * 1996-06-05 2000-05-16 Sun Microsystems, Inc. System and method for indexing between trick play and normal play video streams in a video delivery system
US7177429B2 (en) * 2000-12-07 2007-02-13 Blue Spike, Inc. System and methods for permitting open access to data objects and for securing data within the data objects
US5894516A (en) * 1996-07-10 1999-04-13 Ncr Corporation Broadcast software distribution
US6058192A (en) * 1996-08-06 2000-05-02 Greg Jarque Universal signal processor and method of processing
US6061451A (en) * 1996-09-03 2000-05-09 Digital Vision Laboratories Corporation Apparatus and method for receiving and decrypting encrypted data and protecting decrypted data from illegal use
KR100238098B1 (en) * 1996-09-16 2000-01-15 윤종용 Apparatus for synchronously reproducing multi-angle data
FR2753861B1 (en) * 1996-09-25 1999-03-26 METHOD AND SYSTEM FOR SECURE COMPUTER GAME SERVERS
US6023509A (en) * 1996-09-30 2000-02-08 Intel Corporation Digital signature purpose encoding
US7055166B1 (en) 1996-10-03 2006-05-30 Gotuit Media Corp. Apparatus and methods for broadcast monitoring
US6012144A (en) * 1996-10-08 2000-01-04 Pickett; Thomas E. Transaction security method and apparatus
US5805700A (en) * 1996-10-15 1998-09-08 Intel Corporation Policy based selective encryption of compressed video data
US5917830A (en) 1996-10-18 1999-06-29 General Instrument Corporation Splicing compressed packetized digital video streams
US5828753A (en) * 1996-10-25 1998-10-27 Intel Corporation Circuit and method for ensuring interconnect security within a multi-chip integrated circuit package
US6192131B1 (en) * 1996-11-15 2001-02-20 Securities Industry Automation Corporation Enabling business transactions in computer networks
EP0939944B1 (en) 1996-11-19 2000-12-13 BRITISH TELECOMMUNICATIONS public limited company Communications system
FI964640A (en) 1996-11-21 1998-07-28 Nokia Multimedia Network Terminals Oy Method for transmitting address information
US6543053B1 (en) * 1996-11-27 2003-04-01 University Of Hong Kong Interactive video-on-demand system
US6021201A (en) * 1997-01-07 2000-02-01 Intel Corporation Method and apparatus for integrated ciphering and hashing
US6201927B1 (en) 1997-02-18 2001-03-13 Mary Lafuze Comer Trick play reproduction of MPEG encoded signals
US6049613A (en) * 1997-03-07 2000-04-11 Jakobsson; Markus Method and apparatus for encrypting, decrypting, and providing privacy for data values
US5943605A (en) 1997-04-16 1999-08-24 Lucent Technologies Inc. Arrangement for controlling extraction of data from a broadband digital stream employing a symbol table for translating symbolic program names to program and channel numbers
US6005940A (en) 1997-05-16 1999-12-21 Software Security, Inc. System for securely storing and reading encrypted data on a data medium using a transponder
US6590979B1 (en) 1997-05-29 2003-07-08 Macrovision Corporation Method and apparatus for compression compatible video scrambling
JP3595145B2 (en) 1997-06-02 2004-12-02 三菱電機株式会社 Cryptographic communication system
US6526144B2 (en) 1997-06-02 2003-02-25 Texas Instruments Incorporated Data protection system
US7039802B1 (en) 1997-06-06 2006-05-02 Thomson Licensing Conditional access system for set-top boxes
US6057872A (en) * 1997-07-09 2000-05-02 General Instrument Corporation Digital coupons for pay televisions
US6230194B1 (en) * 1997-07-14 2001-05-08 Freegate Corporation Upgrading a secure network interface
US6011849A (en) * 1997-08-28 2000-01-04 Syndata Technologies, Inc. Encryption-based selection system for steganography
EP0901261B1 (en) * 1997-09-05 2013-01-09 Hitachi, Ltd. Transport protocol conversion method and protocol conversion equipment
US6134237A (en) 1997-09-30 2000-10-17 Motorola, Inc. Method and apparatus for tracking data packets in a packet data communication system
GB9721947D0 (en) 1997-10-16 1997-12-17 Thomson Consumer Electronics Intelligent IP packet scheduler algorithm
US6378130B1 (en) * 1997-10-20 2002-04-23 Time Warner Entertainment Company Media server interconnect architecture
EP2018067A3 (en) 1997-11-18 2009-08-12 Sony Corporation Signal processing device and method for switching signal processors thereof
US6070245A (en) * 1997-11-25 2000-05-30 International Business Machines Corporation Application interface method and system for encryption control
US6057832A (en) 1997-12-02 2000-05-02 V Soft Ltd. Method and apparatus for video-on-demand with fast play capability
US6170075B1 (en) 1997-12-18 2001-01-02 3Com Corporation Data and real-time media communication over a lossy network
US6505032B1 (en) * 2000-05-26 2003-01-07 Xtremespectrum, Inc. Carrierless ultra wideband wireless signals for conveying application data
US6064748A (en) * 1998-01-16 2000-05-16 Hewlett-Packard Company Method and apparatus for embedding and retrieving additional data in an encoded data stream
US6069647A (en) * 1998-01-29 2000-05-30 Intel Corporation Conditional access and content security method
US6327421B1 (en) 1998-03-10 2001-12-04 International Business Machines Corporation Multiple speed fast forward/rewind compressed video delivery system
US6788882B1 (en) 1998-04-17 2004-09-07 Timesurf, L.L.C. Systems and methods for storing a plurality of video streams on re-writable random-access media and time-and channel- based retrieval thereof
US6510554B1 (en) * 1998-04-27 2003-01-21 Diva Systems Corporation Method for generating information sub-streams for FF/REW applications
US6189096B1 (en) * 1998-05-06 2001-02-13 Kyberpass Corporation User authentification using a virtual private key
US6223290B1 (en) 1998-05-07 2001-04-24 Intel Corporation Method and apparatus for preventing the fraudulent use of a cellular telephone
JP3509060B2 (en) 1998-05-28 2004-03-22 松下電器産業株式会社 Display control device and method
US6529526B1 (en) * 1998-07-13 2003-03-04 Thomson Licensing S.A. System for processing programs and program content rating information derived from multiple broadcast sources
JP2000032414A (en) 1998-07-16 2000-01-28 Sony Corp Channel setting method and receiver thereof
US6226618B1 (en) * 1998-08-13 2001-05-01 International Business Machines Corporation Electronic content delivery system
US6219358B1 (en) 1998-09-11 2001-04-17 Scientific-Atlanta, Inc. Adaptive rate control for insertion of data into arbitrary bit rate data streams
US6351538B1 (en) * 1998-10-06 2002-02-26 Lsi Logic Corporation Conditional access and copy protection scheme for MPEG encoded video data
SE513356C2 (en) * 1998-11-20 2000-08-28 Ericsson Telefon Ab L M Method and apparatus for encrypting images
US7089579B1 (en) 1998-12-20 2006-08-08 Tvworks, Llc System for transporting MPEG video as streaming video in an HTML web page
US6452923B1 (en) 1998-12-31 2002-09-17 At&T Corp Cable connected wan interconnectivity services for corporate telecommuters
US7162642B2 (en) 1999-01-06 2007-01-09 Digital Video Express, L.P. Digital content distribution system and method
US6230266B1 (en) * 1999-02-03 2001-05-08 Sun Microsystems, Inc. Authentication system and process
JP3805985B2 (en) 1999-02-18 2006-08-09 株式会社東芝 Stream data information storage medium, recording method, reproducing method, recording apparatus, and reproducing apparatus
US6550008B1 (en) 1999-02-26 2003-04-15 Intel Corporation Protection of information transmitted over communications channels
US6505299B1 (en) * 1999-03-01 2003-01-07 Sharp Laboratories Of America, Inc. Digital image scrambling for image coding systems
US6229895B1 (en) * 1999-03-12 2001-05-08 Diva Systems Corp. Secure distribution of video on-demand
US7730300B2 (en) 1999-03-30 2010-06-01 Sony Corporation Method and apparatus for protecting the transfer of data
US7565546B2 (en) 1999-03-30 2009-07-21 Sony Corporation System, method and apparatus for secure digital content transmission
US6697489B1 (en) 1999-03-30 2004-02-24 Sony Corporation Method and apparatus for securing control words
US6240553B1 (en) * 1999-03-31 2001-05-29 Diva Systems Corporation Method for providing scalable in-band and out-of-band access within a video-on-demand environment
US7096487B1 (en) 1999-10-27 2006-08-22 Sedna Patent Services, Llc Apparatus and method for combining realtime and non-realtime encoded content
US7194758B1 (en) 1999-05-24 2007-03-20 Matsushita Electric Industrial Co., Ltd. Digital broadcast system and its component devices that provide services in accordance with a broadcast watched by viewers
US7336785B1 (en) 1999-07-09 2008-02-26 Koninklijke Philips Electronics N.V. System and method for copy protecting transmitted information
US6549229B1 (en) * 1999-07-26 2003-04-15 C-Cubed Corporation Small, portable, self-contained, video teleconferencing system
US6289455B1 (en) 1999-09-02 2001-09-11 Crypotography Research, Inc. Method and apparatus for preventing piracy of digital content
US6697944B1 (en) * 1999-10-01 2004-02-24 Microsoft Corporation Digital content distribution, transmission and protection system and method, and portable device for use therewith
WO2001031914A1 (en) 1999-10-27 2001-05-03 Diva Systems Corporation Picture-in-picture and multiple video streams using slice-based encoding
FR2801464B1 (en) 1999-11-22 2001-12-28 Thomson Multimedia Sa METHOD FOR RECORDING A SCRATCHED MPEG STREAM
US7096481B1 (en) 2000-01-04 2006-08-22 Emc Corporation Preparation of metadata for splicing of encoded MPEG video and audio
US6857132B1 (en) * 2000-01-14 2005-02-15 Terayon Communication Systems, Inc. Head end multiplexer to select and transmit video-on-demand and other requested programs and services
US6988238B1 (en) 2000-01-24 2006-01-17 Ati Technologies, Inc. Method and system for handling errors and a system for receiving packet stream data
US6621866B1 (en) 2000-01-28 2003-09-16 Thomson Licensing S.A. Method for inserting a visual element into an MPEG bit stream
WO2001058132A2 (en) 2000-02-02 2001-08-09 Worldgate Service, Inc. System and method for transmitting and displaying targeted information
US7146007B1 (en) 2000-03-29 2006-12-05 Sony Corporation Secure conditional access port interface
US6684250B2 (en) * 2000-04-03 2004-01-27 Quova, Inc. Method and apparatus for estimating a geographic location of a networked entity
JP2001326875A (en) 2000-05-16 2001-11-22 Sony Corp Image processing unit and image processing method, and recording medium
US20040261099A1 (en) 2000-06-21 2004-12-23 Durden George A. Method for formulating, delivering and managing data concerning programming content and portions thereof
JP4034502B2 (en) 2000-06-30 2008-01-16 株式会社東芝 Broadcast program recording / playback method and broadcast program recording / playback apparatus
DE60135347D1 (en) 2000-07-14 2008-09-25 Irdeto Access Bv ARCHITECTURE FOR SECURE PACKAGE-BASED DATA DISTRIBUTION
US6853728B1 (en) 2000-07-21 2005-02-08 The Directv Group, Inc. Video on demand pay per view services with unmodified conditional access functionality
WO2002029509A2 (en) 2000-10-03 2002-04-11 Vidius Inc. Secure distribution of digital content
AU2002213178A1 (en) 2000-10-13 2002-04-22 Astrolink International, Llc Distributed ip over atm architecture
US20020046406A1 (en) * 2000-10-18 2002-04-18 Majid Chelehmal On-demand data system
US20020083438A1 (en) * 2000-10-26 2002-06-27 So Nicol Chung Pang System for securely delivering encrypted content on demand with access contrl
US7508454B1 (en) 2000-11-16 2009-03-24 Smardtv Sa Digital television conditional access methods and apparatus for simultaneously handling multiple television programs
US20020066101A1 (en) 2000-11-27 2002-05-30 Gordon Donald F. Method and apparatus for delivering and displaying information for a multi-layer user interface
US8225361B2 (en) 2000-11-27 2012-07-17 Cox Communications, Inc. Remote monitoring and control method and apparatus for an information distribution system
CN1355654A (en) * 2000-11-28 2002-06-26 北京华诺信息技术有限公司 Encryption system for cable TV network
EP1215905B2 (en) 2000-12-15 2010-04-21 Panasonic Corporation Reception apparatus having a storage unit for recording a scrambled broadcast signal and broadcast apparatus for scrambling a signal to be broadcast, and associated methods
US7472280B2 (en) 2000-12-27 2008-12-30 Proxense, Llc Digital rights management
US6990151B2 (en) 2001-03-05 2006-01-24 Intervideo, Inc. Systems and methods for enhanced error concealment in a video decoder
US20020144260A1 (en) 2001-03-29 2002-10-03 Koninklijke Philips Electronics N.V. Method for adaptive data/content insertion in MPEG2 transport stream
US20020178445A1 (en) 2001-04-03 2002-11-28 Charles Eldering Subscriber selected advertisement display and scheduling
US20020157115A1 (en) 2001-04-24 2002-10-24 Koninklijke Philips Electronics N.V. Wireless communication point of deployment module for use in digital cable compliant devices
US7158185B2 (en) 2001-05-01 2007-01-02 Scientific-Atlanta, Inc. Method and apparatus for tagging media presentations with subscriber identification information
US20020194589A1 (en) 2001-05-08 2002-12-19 Cristofalo Michael Technique for optimizing the delivery of advertisements and other programming segments by making bandwidth tradeoffs
WO2002097580A2 (en) * 2001-05-31 2002-12-05 Espeed, Inc. Securities trading system with multiple levels-of-interest
US7350082B2 (en) * 2001-06-06 2008-03-25 Sony Corporation Upgrading of encryption
US7747853B2 (en) 2001-06-06 2010-06-29 Sony Corporation IP delivery of secure digital content
US7895616B2 (en) 2001-06-06 2011-02-22 Sony Corporation Reconstitution of program streams split across multiple packet identifiers
US7356245B2 (en) * 2001-06-29 2008-04-08 International Business Machines Corporation Methods to facilitate efficient transmission and playback of digital information
US7421411B2 (en) * 2001-07-06 2008-09-02 Nokia Corporation Digital rights management in a mobile communications environment
US6883050B1 (en) 2001-08-09 2005-04-19 General Instrument Corporation Optimized POD module/host interface
US7463737B2 (en) 2001-08-15 2008-12-09 Digeo, Inc. System and method for conditional access key encryption
US7224797B2 (en) 2001-08-17 2007-05-29 Koninklijke Philips Electronics N.V. System and method for hybrid conditional access for receivers of encrypted transmissions
WO2003017649A1 (en) 2001-08-20 2003-02-27 Koninklijke Philips Electronics N.V. Image size extension
US20030046687A1 (en) 2001-09-06 2003-03-06 Octiv, Inc. Techniques for manipulating programming breaks in streaming content
US6925180B2 (en) 2001-09-27 2005-08-02 Sony Corporation PC card recorder
US7369520B2 (en) * 2001-10-02 2008-05-06 Nokia Corporation Internet protocol address to packet identifier mapping
US20030077071A1 (en) * 2001-10-23 2003-04-24 Shu Lin Fast forward trick mode and reverse trick mode using an information file
US7155012B2 (en) 2002-01-02 2006-12-26 Sony Corporation Slice mask and moat pattern partial encryption
US8027470B2 (en) 2002-01-02 2011-09-27 Sony Corporation Video slice and active region based multiple partial encryption
US7823174B2 (en) 2002-01-02 2010-10-26 Sony Corporation Macro-block based content replacement by PID mapping
US7376233B2 (en) 2002-01-02 2008-05-20 Sony Corporation Video slice and active region based multiple partial encryption
US7292691B2 (en) 2002-01-02 2007-11-06 Sony Corporation Progressive video refresh slice detection
US7215770B2 (en) 2002-01-02 2007-05-08 Sony Corporation System and method for partially encrypted multimedia stream
US7242773B2 (en) * 2002-09-09 2007-07-10 Sony Corporation Multiple partial encryption using retuning
US7218738B2 (en) 2002-01-02 2007-05-15 Sony Corporation Encryption and content control in a digital broadcast system
US7765567B2 (en) 2002-01-02 2010-07-27 Sony Corporation Content replacement by PID mapping
US8051443B2 (en) 2002-01-02 2011-11-01 Sony Corporation Content replacement by PID mapping
US7292690B2 (en) 2002-01-02 2007-11-06 Sony Corporation Video scene change detection
US7302059B2 (en) 2002-01-02 2007-11-27 Sony Corporation Star pattern partial encryption
US7039938B2 (en) 2002-01-02 2006-05-02 Sony Corporation Selective encryption for video on demand
US7233669B2 (en) 2002-01-02 2007-06-19 Sony Corporation Selective encryption to enable multiple decryption keys
US20040010717A1 (en) * 2002-01-29 2004-01-15 Intertainer Asia Pte Ltd. Apparatus and method for preventing digital media piracy
US7328345B2 (en) * 2002-01-29 2008-02-05 Widevine Technologies, Inc. Method and system for end to end securing of content for video on demand
US6775394B2 (en) 2002-03-12 2004-08-10 Matsushita Electric Industrial Co., Ltd. Digital watermarking of binary document using halftoning
DE10212656A1 (en) 2002-03-21 2003-10-02 Scm Microsystems Gmbh Selective encryption of multimedia data
US7305555B2 (en) 2002-03-27 2007-12-04 General Instrument Corporation Smart card mating protocol
US7287275B2 (en) * 2002-04-17 2007-10-23 Moskowitz Scott A Methods, systems and devices for packet watermarking and efficient provisioning of bandwidth
US7530084B2 (en) 2002-05-28 2009-05-05 Sony Corporation Method and apparatus for synchronizing dynamic graphics
FR2842691B1 (en) * 2002-07-18 2005-01-14 Canon Kk METHOD AND DEVICE FOR TRANSFORMING A DIGITAL SIGNAL
US7167560B2 (en) * 2002-08-08 2007-01-23 Matsushita Electric Industrial Co., Ltd. Partial encryption of stream-formatted media
US8818896B2 (en) 2002-09-09 2014-08-26 Sony Corporation Selective encryption with coverage encryption
US7295673B2 (en) * 2002-10-23 2007-11-13 Divx, Inc. Method and system for securing compressed digital video
US20050015816A1 (en) 2002-10-29 2005-01-20 Actv, Inc System and method of providing triggered event commands via digital program insertion splicing
US7724907B2 (en) 2002-11-05 2010-05-25 Sony Corporation Mechanism for protecting the transfer of digital content
US8572408B2 (en) 2002-11-05 2013-10-29 Sony Corporation Digital rights management of a digital device
US6859335B1 (en) * 2002-11-20 2005-02-22 Ming Lai Method of programmed displacement for prolong usage of optical elements under the irradiation of intensive laser beams
US8645988B2 (en) 2002-12-13 2014-02-04 Sony Corporation Content personalization for digital content
US8667525B2 (en) 2002-12-13 2014-03-04 Sony Corporation Targeted advertisement selection from a digital stream
US20040165586A1 (en) 2003-02-24 2004-08-26 Read Christopher Jensen PID filters based network routing
US20040172650A1 (en) 2003-02-28 2004-09-02 Hawkins William J. Targeted content delivery system in an interactive television network
US7409702B2 (en) * 2003-03-20 2008-08-05 Sony Corporation Auxiliary program association table
US7292692B2 (en) 2003-03-25 2007-11-06 Sony Corporation Content scrambling with minimal impact on legacy devices
US7310423B2 (en) 2003-04-24 2007-12-18 General Instrument Corporation Processing multiple encrypted transport streams
US6707696B1 (en) 2003-05-15 2004-03-16 Broadcom Corporation Hacker-proof one time programmable memory
US8014651B2 (en) 2003-06-26 2011-09-06 International Business Machines Corporation MPEG-2 decoder, method and buffer scheme for providing enhanced trick mode playback of a video stream
US20050036067A1 (en) 2003-08-05 2005-02-17 Ryal Kim Annon Variable perspective view of video images
US20050066357A1 (en) 2003-09-22 2005-03-24 Ryal Kim Annon Modifying content rating
US20050071663A1 (en) * 2003-09-26 2005-03-31 General Instrument Corporation Separation of copy protection rules for digital rights management
US7263187B2 (en) 2003-10-31 2007-08-28 Sony Corporation Batch mode session-based encryption of video on demand content
US7853980B2 (en) 2003-10-31 2010-12-14 Sony Corporation Bi-directional indices for trick mode video-on-demand
US20050097596A1 (en) 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Re-encrypted delivery of video-on-demand content
US20050097597A1 (en) 2003-10-31 2005-05-05 Pedlow Leo M.Jr. Hybrid storage of video on demand content
US7620180B2 (en) 2003-11-03 2009-11-17 Sony Corporation Preparation of content for multiple conditional access methods in video on demand
US7346163B2 (en) 2003-10-31 2008-03-18 Sony Corporation Dynamic composition of pre-encrypted video on demand content
US7343013B2 (en) 2003-12-16 2008-03-11 Sony Corporation Composite session-based encryption of video on demand content
US20050102702A1 (en) 2003-11-12 2005-05-12 Candelore Brant L. Cablecard with content manipulation
US7519274B2 (en) * 2003-12-08 2009-04-14 Divx, Inc. File format for multiple track digital data
US20050169473A1 (en) 2004-02-03 2005-08-04 Candelore Brant L. Multiple selective encryption with DRM
US8041190B2 (en) 2004-12-15 2011-10-18 Sony Corporation System and method for the creation, synchronization and delivery of alternate content
US20060130119A1 (en) 2004-12-15 2006-06-15 Candelore Brant L Advanced parental control for digital content
US7895617B2 (en) 2004-12-15 2011-02-22 Sony Corporation Content substitution editor
GB0519524D0 (en) * 2005-09-24 2005-11-02 Ibm Method and apparatus for verifying encryption of SIP signalling
US7555464B2 (en) 2006-03-01 2009-06-30 Sony Corporation Multiple DRM management

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3821702A (en) 1971-05-22 1974-06-28 Nissan Motor Lighting system for controlling lights of motor vehicle to glow in a reduced luminous intensity during the nighttime
US20020196939A1 (en) 2001-06-06 2002-12-26 Unger Robert Allan Decoding and decryption of partially encrypted information

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP1609313A4

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2505931C2 (en) * 2008-06-30 2014-01-27 Томсон Лайсенсинг Methods and apparatus for selective data encryption
US8804591B2 (en) 2009-09-18 2014-08-12 Interdigital Patent Holdings, Inc. Method and apparatus for multicast mobility
US9191224B2 (en) 2009-09-18 2015-11-17 Interdigital Patent Holdings, Inc. Method for multicast mobility

Also Published As

Publication number Publication date
CN102045590B (en) 2016-09-14
US7773750B2 (en) 2010-08-10
KR20060112197A (en) 2006-10-31
JP2006523424A (en) 2006-10-12
KR101054161B1 (en) 2011-08-03
US20040073917A1 (en) 2004-04-15
CA2517433C (en) 2012-01-03
US20070204146A1 (en) 2007-08-30
WO2005029756A3 (en) 2005-09-22
US7215770B2 (en) 2007-05-08
CA2517433A1 (en) 2005-03-31
JP4477628B2 (en) 2010-06-09
EP1609313A4 (en) 2012-02-08
CN1768534A (en) 2006-05-03
EP1609313B1 (en) 2021-05-19
EP1609313A2 (en) 2005-12-28
CN102045590A (en) 2011-05-04

Similar Documents

Publication Publication Date Title
US7215770B2 (en) System and method for partially encrypted multimedia stream
US8265277B2 (en) Content scrambling with minimal impact on legacy devices
JP4838422B2 (en) Transmission system
KR20040070300A (en) Partial encryption and pid mapping
KR100993456B1 (en) Apparatus for partial duplicate and partial encryption for packets, appratus for decryption for packets, method of partial duplicating and partial encrypting packets, method of decrypting packets, and computer readable storing medium
KR101004196B1 (en) Elementary stream partial encryption
KR100989015B1 (en) Decoding and decryption of partially encrypted information
KR20090026219A (en) Partial encryption and pid mapping
US8631430B2 (en) Enabling DRM-encrypted broadcast content through gateway into the home
WO2000045598A1 (en) Transmission system
EP2667631A1 (en) Data processing system and method
KR100924053B1 (en) Critical packet partial encryption
KR101053376B1 (en) Time Division Partial Encryption
KR101029427B1 (en) Elementary Stream Partial Encryption

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A2

Designated state(s): AE AG AL AM AT AU AZ BA BB BG BW BY BZ CA CH CN CO CR CU CZ DK DM DZ EC EE EG ES FI GB GD GE GM HR HU ID IL IN IS JP KE KG KP KZ LC LK LR LS LT LU LV MA MD MK MN MW MX MZ NA NI NO NZ PG PH PL PT RO RU SC SD SE SG SK SY TJ TM TN TR TT TZ UA UG US UZ VN YU ZA ZM

AL Designated countries for regional patents

Kind code of ref document: A2

Designated state(s): BW GH GM KE LS MW MZ SD SL TZ UG ZM ZW AM AZ BY KG MD RU TJ TM AT BE BG CH CY DE DK EE ES FI FR GB GR HU IE IT MC NL PL PT RO SE SI SK TR BF CF CG CI CM GA GN GQ GW ML MR SN TD TG

121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 2517433

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 2004785864

Country of ref document: EP

WWE Wipo information: entry into national phase

Ref document number: 20048088765

Country of ref document: CN

Ref document number: 1020057018437

Country of ref document: KR

WWE Wipo information: entry into national phase

Ref document number: 2006509238

Country of ref document: JP

WWP Wipo information: published in national office

Ref document number: 2004785864

Country of ref document: EP