CA2498326A1 - Content distribution for multiple digital rights management - Google Patents

Content distribution for multiple digital rights management Download PDF

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Publication number
CA2498326A1
CA2498326A1 CA002498326A CA2498326A CA2498326A1 CA 2498326 A1 CA2498326 A1 CA 2498326A1 CA 002498326 A CA002498326 A CA 002498326A CA 2498326 A CA2498326 A CA 2498326A CA 2498326 A1 CA2498326 A1 CA 2498326A1
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CA
Canada
Prior art keywords
content
drm
encrypted
segments
pointers
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
CA002498326A
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French (fr)
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CA2498326C (en
Inventor
Brant L. Candelore
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Sony Electronics Inc
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Individual
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Publication of CA2498326A1 publication Critical patent/CA2498326A1/en
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Publication of CA2498326C publication Critical patent/CA2498326C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • H04N21/45—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
    • H04N21/4627—Rights management associated to the content
    • 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
    • H04N21/434—Disassembling of a multiplex stream, e.g. demultiplexing audio and video streams, extraction of additional data from a video stream; Remultiplexing of multiplex streams; Extraction or processing of SI; Disassembling of packetised elementary stream
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
    • H04K1/00—Secret communication
    • 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
    • H04L9/32—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols including means for verifying the identity or authority of a user of the system or for message authentication, e.g. authorization, entity authentication, data integrity or data verification, non-repudiation, key authentication or verification of credentials
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    • H04N21/2343—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements
    • H04N21/234345—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving reformatting operations of video signals for distribution or compliance with end-user requests or end-user device requirements the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
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    • H04N21/254—Management at additional data server, e.g. shopping server, rights management server
    • H04N21/2543—Billing, e.g. for subscription services
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    • H04N21/258—Client or end-user data management, e.g. managing client capabilities, user preferences or demographics, processing of multiple end-users preferences to derive collaborative data
    • H04N21/25808—Management of client data
    • H04N21/25833—Management of client data involving client hardware characteristics, e.g. manufacturer, processing or storage capabilities
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    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/26606—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM]
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    • H04N21/266—Channel or content management, e.g. generation and management of keys and entitlement messages in a conditional access system, merging a VOD unicast channel into a multicast channel
    • H04N21/2668—Creating a channel for a dedicated end-user group, e.g. insertion of targeted commercials based on end-user profiles
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    • H04N21/433—Content storage operation, e.g. storage operation in response to a pause request, caching operations
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    • 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
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/24—Systems for the transmission of television signals using pulse code modulation
    • H04N7/52—Systems for transmission of a pulse code modulated video signal with one or more other pulse code modulated signals, e.g. an audio signal or a synchronizing signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/79—Processing of colour television signals in connection with recording
    • H04N9/7921—Processing of colour television signals in connection with recording for more than one processing mode
    • H04N9/7925—Processing of colour television signals in connection with recording for more than one processing mode for more than one standard
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/76—Television signal recording
    • H04N5/91—Television signal processing therefor
    • H04N5/913—Television signal processing therefor for scrambling ; for copy protection
    • H04N2005/91357—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal
    • H04N2005/91364—Television signal processing therefor for scrambling ; for copy protection by modifying the video signal the video signal being scrambled

Abstract

A method and apparatus for enabling use of multiple digital rights management scenarios (DRM). Unencrypted data representing digital content is examined to identify at least segments of content for encryption (608). The identified segments of content are duplicated (610) and then encrypted using a first encryption method associated with a first DRM to produce first encrypted segments. Duplicates are encrypted using a second encryption method associated with a second DRM to produce second encrypted segments (614). A set of pointers are generated that point to the first and second encrypted segments content (618). A file is then created containing first and second encrypted segments of content (622). A file is then created containing first and second encrypted segments of content, pointers and unencrypted content along with DRM
rights data to produce a selectively encrypted multiple DRM enabled file.

Claims (34)

1. A method of enabling use of multiple digital rights management scenarios (DRM), comprising:
examining unencrypted data representing digital content to identify at least segments of content for encryption;
encrypting the identified segments of content using a first encryption method associated with a first DRM to produce first encrypted segments;
encrypting the identified segments of content using a second encryption method associated with a second DRM to produce second encrypted segments;
generating first pointers to the first encrypted segments of content;
generating second pointers to the second encrypted segments of content;
and replacing the identified segments of content with the first encrypted content and the second encrypted content in the digital content, and inserting the first and second pointers to produce a partially encrypted dual DRM enabled file.
2. The method according to claim 1, wherein the content comprises digitized audio.
3. The method according to claim 1, wherein the content comprises digitized video.
4. The method according to claim 1, further comprising appending data to enable digital rights under the first DRM to the file.
5. The method according to claim 1, further comprising appending data to enable digital rights under the second DRM to the file.
6. The method according to claim 1, wherein the first and second pointers comprise byte offsets identifying a starting location for encrypted segments of content.
7. The method according to claim 1, wherein the first and second encrypted segments of content have a duration defined by an encryption quanta.
8. The method according to claim 1, further comprising appending data to enable digital rights under at least one of the first DRM and the second DRM
to the file; and transmitting the file to a customer.
9. A computer, readable medium storing instructions which, when executed on a programmed processor, carry out the method of method of enabling use of multiple digital rights management scenarios according to claim 1.
10. An encoder that enables use of multiple digital rights management scenarios (DRM), comprising:
means for examining unencrypted data representing digital content to identify at least segments of content for encryption;
a first encrypter that encrypts the identified segments of content using a first encryption method associated with a first DRM to produce first encrypted segments;
a second encrypter. that encrypts the identified segments of content using a second encryption method associated with a second DRM to produce second encrypted segments;
means for generating first pointers to the first encrypted segments of content;
means for generating second pointers to the second encrypted segments of content; and means for replacing the identified segments of content with the first encrypted content and the second encrypted content in the digital content, and inserting the first and second pointers to produce a partially encrypted dual DRM
enabled file.
11. The encoder according to claim 10, wherein the content comprises at least one of digitized audio and digitized video.
12. The encoder according to claim 10, further comprising means for appending data to enable digital rights under at least one of the first DRM
and the second DRM to the file.
13. The encoder according to claim 10, wherein the first and second pointers comprise byte offsets identifying a starting location for encrypted segments of content.
14. The encoder according to claim 10, wherein the first and second encrypted segments of content have a duration defined by an encryption quanta.
15. The encoder according to claim 10, further comprising appending data to enable digital rights under at least one of the first DRM and the second DRM
to the file; and transmitting the file to a customer.
16. The encoder according to claim 10, implemented in a programmed general purpose computer.
17. A method of using rights to digital content under one of a plurality of digital rights management scenarios (DRM), comprising:
carrying out a transaction to acquire digital rights to the content;
receiving digital content containing:
segments of unencrypted content, first encrypted segments of content encrypted using a first encryption method associated with a first DRM, second encrypted segments of content encrypted using a second encryption method associated with a second DRM, first pointers to the first encrypted segments of content;
second pointers to the second encrypted segments of content, and DRM data that enables digital rights under at least one of the first DRM and the second DRM;
determining that valid digital rights are available from the DRM data; and decrypting one of the first and second encrypted segments to enable playing of the content.
18. The method according to claim 17, wherein the content comprises at least one of digitized audio and digitized video.
19. The method according to claim 17, wherein the first and second pointers comprise byte offsets identifying a starting location for encrypted segments of content.
20. The method according to claim 17, wherein the first and second encrypted segments of content have a duration defined by an encryption quanta.
21. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of method of using rights to digital content according to claim 17.
22. A decoder that enables use rights to digital content under one of a plurality of digital rights management scenarios (DRM), comprising:
means for carrying out a transaction to acquire digital rights to the content;
means for receiving digital content containing:
segments of unencrypted content, first encrypted segments of content encrypted using a first encryption method associated with a first DRM, second encrypted segments of content encrypted using a second encryption method associated with a second DRM, first pointers to the first encrypted segments of content;
second pointers to the second encrypted segments of content, and DRM data that enables digital rights under at least one of the first DRM and the second DRM;
a DRM validator that determines that valid digital rights are available from the DRM data; and a decrypter that decrypts one of the encrypted segments to enable playing the content.
23. The decrypter according to claim 22, wherein the content comprises at least one of digitized audio and digitized video.
24. The decrypter according to claim 22, wherein the first and second pointers comprise byte offsets identifying a starting location for encrypted segments of content.
25. The decrypter according to claim 22, wherein the first and second encrypted segments of content have a duration defined by an encryption quanta.
26. The decrypter according to claim 22, implemented in a programmed general purpose computer.
27. A selectively encrypted digital content signal that enables use of multiple digital rights management scenarios (DRM) embodied in a carrier wave, comprising:
segments of unencrypted content;
first encrypted segments of content encrypted using a first encryption method associated with a first DRM;
second encrypted segments of content encrypted using a second encryption method associated with a second DRM;
a first segment of code comprising first pointers to the first encrypted segments of content;
a second segment of code comprising second pointers to the second encrypted segments of content; and a segment of DRM data that enables digital rights under at least one of the first DRM and the second DRM.
28. The carrier wave according to claim 27, wherein the content comprises at least one of digitized audio and digitized video.
29. The carrier wave according to claim 27, wherein the first and second pointers comprise byte offsets identifying a starting location for encrypted segments of content.
30. The carrier wave according to claim 27, wherein the first and second encrypted segments of content have a duration defined by an encryption quanta.
31. A selectively encrypted digital content signal that enables use of multiple digital rights management scenarios (DRM) embodied in a computer readable medium, comprising:
segments of unencrypted content;
first encrypted segments of content encrypted using a first encryption method associated with a first DRM;
second encrypted segments of content encrypted using a second encryption method associated with a second DRM;
a first segment of code comprising first pointers to the first encrypted segments of content;
a second segment of code comprising second pointers to the second encrypted segments of content; and a segment of DRM data that enables digital rights under at least one of the first DRM and the second DRM.
32. The computer readable medium according to claim 31, wherein the content comprises at least one of digitized audio and digitized video.
33. The computer readable medium according to claim 31, wherein the first and second pointers comprise byte offsets identifying a starting location for encrypted segments of content.
34. The computer readable medium according to claim 31, wherein the first and second encrypted segments of content have a duration defined by an encryption quanta.
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