CA2517433A1 - System and method for partially encrypted multimedia stream - Google Patents
System and method for partially encrypted multimedia stream Download PDFInfo
- Publication number
- CA2517433A1 CA2517433A1 CA002517433A CA2517433A CA2517433A1 CA 2517433 A1 CA2517433 A1 CA 2517433A1 CA 002517433 A CA002517433 A CA 002517433A CA 2517433 A CA2517433 A CA 2517433A CA 2517433 A1 CA2517433 A1 CA 2517433A1
- Authority
- CA
- Canada
- Prior art keywords
- stream
- encrypted
- encrypted stream
- predetermined portions
- partially encrypted
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Classifications
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- 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
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- 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
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".
(24) without the legacy CA (20) knowing which of the packets that it encrypts are "critical".
Claims (17)
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 stream to a first conditional access (CA) component (20) to encrypt the entire first clear stream to render a completely encrypted stream;
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 stream; and inserting the encrypted predetermined portions obtained from the completely encrypted stream into the partially encrypted stream for transmission thereof.
generating a copy of a multimedia stream to render first and second clear streams having identical predetermined portions;
sending the first clear stream to a first conditional access (CA) component (20) to encrypt the entire first clear stream to render a completely encrypted stream;
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 stream; 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 stream 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 streams using corresponding offsets from at least one packet identifier (PID).
6. The method of Claim 5, wherein the offsets are m integral numbers of packets 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 stream.
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 stream.
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 stream to render a partially encrypted stream;
legacy CA means (20) for encrypting the entire second stream to render a substantially fully encrypted stream; and means (24) for combining only critical portions from the fully encrypted stream with the partially encrypted stream.
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 stream to render a partially encrypted stream;
legacy CA means (20) for encrypting the entire second stream to render a substantially fully encrypted stream; and means (24) for combining only critical portions from the fully encrypted stream with the partially encrypted stream.
10. The system of Claim 9, further comprising means (26) for transmitting the partially encrypted stream.
11. The system of Claim 9, comprising means (26) for transmitting the partially encrypted stream to plural set-top boxes over cable.
12. The system of Claim 9, comprising means (26) for wirelessly broadcasting the 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 stream.
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).
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 stream 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).
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).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/403,834 US7215770B2 (en) | 2002-01-02 | 2003-03-31 | System and method for partially encrypted multimedia stream |
US10/403,834 | 2003-03-31 | ||
PCT/US2004/006987 WO2005029756A2 (en) | 2003-03-31 | 2004-03-08 | System and method for partially encrypted multimedia stream |
Publications (2)
Publication Number | Publication Date |
---|---|
CA2517433A1 true CA2517433A1 (en) | 2005-03-31 |
CA2517433C CA2517433C (en) | 2012-01-03 |
Family
ID=34375137
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CA2517433A Expired - Lifetime CA2517433C (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) | CN1768534A (en) |
CA (1) | CA2517433C (en) |
WO (1) | WO2005029756A2 (en) |
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WO2005029756A2 (en) | 2005-03-31 |
JP2006523424A (en) | 2006-10-12 |
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EP1609313B1 (en) | 2021-05-19 |
WO2005029756A3 (en) | 2005-09-22 |
CN102045590B (en) | 2016-09-14 |
KR101054161B1 (en) | 2011-08-03 |
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US7215770B2 (en) | 2007-05-08 |
JP4477628B2 (en) | 2010-06-09 |
EP1609313A2 (en) | 2005-12-28 |
US20070204146A1 (en) | 2007-08-30 |
CN102045590A (en) | 2011-05-04 |
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