CA2199526A1 - Conditional access system - Google Patents

Conditional access system

Info

Publication number
CA2199526A1
CA2199526A1 CA002199526A CA2199526A CA2199526A1 CA 2199526 A1 CA2199526 A1 CA 2199526A1 CA 002199526 A CA002199526 A CA 002199526A CA 2199526 A CA2199526 A CA 2199526A CA 2199526 A1 CA2199526 A1 CA 2199526A1
Authority
CA
Canada
Prior art keywords
information
conditional access
encrypted
received
decryptor
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
Application number
CA002199526A
Other languages
French (fr)
Other versions
CA2199526C (en
Inventor
Charles F. Newby
Michael V. Harding
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Engility LLC
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of CA2199526A1 publication Critical patent/CA2199526A1/en
Application granted granted Critical
Publication of CA2199526C publication Critical patent/CA2199526C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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]
    • H04N21/40—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
    • 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
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/418—External card to be used in combination with the client device, e.g. for conditional access
    • H04N21/4181—External card to be used in combination with the client device, e.g. for conditional access for conditional access
    • 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
    • H04N21/44—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs
    • H04N21/4405—Processing of video elementary streams, e.g. splicing a video clip retrieved from local storage with an incoming video stream, rendering scenes according to MPEG-4 scene graphs involving video stream decryption
    • 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
    • H04N21/45—Management operations performed by the client for facilitating the reception of or the interaction with the content or administrating data related to the end-user or to the client device itself, e.g. learning user preferences for recommending movies, resolving scheduling conflicts
    • H04N21/462—Content or additional data management, e.g. creating a master electronic program guide from data received from the Internet and a Head-end, controlling the complexity of a video stream by scaling the resolution or bit-rate based on the client capabilities
    • H04N21/4623—Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/162—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
    • H04N7/163—Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing by receiver means only
    • 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

Abstract

An access control processor for a conditional access system in which encrypted information segments provided by a plurality of information service providers are encrypted for transmission in accordance with different conditional access processes respectively utilizing different algorithms for encrypting the information segments. The processor includes a decryptor in an information receiver by decrypting encrypted information segmets received by the information receiver by processing the received encrypted information segments with a session key used for encrypting the information segments in accordance with an algorithm utilized in one of said conditional access processes; and a conditional access controller in the information receiver for selectively enabling the decryptor to decrypt received information segments encrypted in accordance with any of said different conditional access processes by providing to the decryptor cryptographic information for defining the algorithm utilized in said one of said different conditional access processes for use by the decryptor to decrypt the received information segment encrypted in accordance with said algorithm. Algorithm-defining cryptographic information is downloaded from an information stream received by the information receiver. Transmission of the cryptographic information for enabling the conditional access controller to enable the decryptor to decrypt a selected information segment may be requested by the conditional access controller and downloaded to the conditional access controller from an information stream received by the information receiver. A message related to an authorization status of the information receiver is retrieved for display from a plurality of different possible authorization status messages within an information stream received by the information receiver. Computer readable storage media are so configured as to cause the access control processor to perform its various functions.
CA002199526A 1994-09-09 1995-08-17 Conditional access system Expired - Fee Related CA2199526C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US30340994A 1994-09-09 1994-09-09
US08/303,409 1994-09-09
PCT/US1995/010571 WO1996008912A2 (en) 1994-09-09 1995-08-17 Conditional access system

Publications (2)

Publication Number Publication Date
CA2199526A1 true CA2199526A1 (en) 1996-03-21
CA2199526C CA2199526C (en) 2005-04-12

Family

ID=23171941

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002199526A Expired - Fee Related CA2199526C (en) 1994-09-09 1995-08-17 Conditional access system

Country Status (7)

Country Link
US (3) US5796829A (en)
EP (1) EP0787391B1 (en)
AU (1) AU4461996A (en)
CA (1) CA2199526C (en)
DE (1) DE69525170T2 (en)
ES (1) ES2171568T3 (en)
WO (1) WO1996008912A2 (en)

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* Cited by examiner, † Cited by third party
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WO1996008912A2 (en) 1996-03-21
ES2171568T3 (en) 2002-09-16
DE69525170D1 (en) 2002-03-14
CA2199526C (en) 2005-04-12
EP0787391B1 (en) 2002-01-23
US6108422A (en) 2000-08-22
US5796829A (en) 1998-08-18
US6115821A (en) 2000-09-05
DE69525170T2 (en) 2002-10-10
AU4461996A (en) 1996-03-29
WO1996008912A3 (en) 1996-06-06
EP0787391A1 (en) 1997-08-06
EP0787391A4 (en) 1998-04-08

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