Content distribution for multiple digital rights management

• US 20040049694A1
• Filed: 12/13/2002
• Published: 03/11/2004
• Est. Priority Date: 09/09/2002
• Status: Active Grant

• Current Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Original Assignee: Sony Corporation (Sony Group Corp.), Sony Electronics Inc. (Sony Group Corp.)
• Inventors: Candelore, Brant L.
• Granted Patent: US 7,120,250 B2
• Time in Patent Office: Days
• US Class Current: 713/200
• CPC Class Codes: H04N 2005/91364 the video signal being scrambled
• CPC Class Codes: H04N 21/234345 the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
• CPC Class Codes: H04N 21/23439 for generating different versions
• CPC Class Codes: H04N 21/2347 involving video stream encryption
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie
• CPC Class Codes: H04N 21/235 Processing of additional data, e.g. scrambling of additional data or processing content descriptors
• CPC Class Codes: H04N 21/236 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 multiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/238 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 hybrid fiber coaxial [HFC] networks for downstream channel allocation for video distribution H04L12/2801; flow control in packet networks H04L47/10; real-time communication protocols in data switching networks H04L65/00; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/25435 involving characteristics of content or additional data, e.g. video resolution or the amount of advertising
• CPC Class Codes: H04N 21/25833 involving client hardware characteristics, e.g. manufacturer, processing or storage capabilities allocation of resources considering hardware capabilities in multiprogramming arrangements G06F9/5044; allocation of resources considering software capabilities in multiprogramming arrangements G06F9/5055
• CPC Class Codes: H04N 21/26606 for generating or managing entitlement messages, e.g. Entitlement Control Message [ECM] or Entitlement Management Message [EMM] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/2668 Creating a channel for a dedicated end-user group, e.g. insertion of targeted commercials based on end-user profiles information retrieval from the Internet by querying with filtering and personalisation G06F16/9535; arrangements for replacing or switching information during the broadcast H04H20/10; push services over packet-switching network H04L12/1859; adaptation of message content in packet-switching networks H04L51/063
• CPC Class Codes: H04N 21/4331 Caching operations, e.g. of an advertisement for later insertion during playback
• CPC Class Codes: H04N 21/4333 Processing operations in response to a pause request
• CPC Class Codes: H04N 21/434 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 demultiplexing of data packets for data networks, e.g. RTP/UDP H04L65/00
• CPC Class Codes: H04N 21/435 Processing of additional data, e.g. decrypting of additional data, reconstructing software from modules extracted from the transport stream
• CPC Class Codes: H04N 21/43607 Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
• CPC Class Codes: H04N 21/440245 the reformatting operation being performed only on part of the stream, e.g. a region of the image or a time segment
• CPC Class Codes: H04N 21/440281 by altering the temporal resolution, e.g. by frame skipping television signal recording using magnetic recording on tape for reproducing at a rate different from the recording rate H04N5/783
• CPC Class Codes: H04N 21/44055 by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
• CPC Class Codes: H04N 21/458 : Scheduling content for creating a personalised stream, e.g. by combining a locally stored advertisement with an incoming stream; Updating operations, e.g. for OS modules ; time-related management operations arrangements for replacing or switching information during the broadcast or during the distribution H04H20/10
• CPC Class Codes: H04N 21/4623 : Processing of entitlement messages, e.g. ECM [Entitlement Control Message] or EMM [Entitlement Management Message] arrangements for conditional access to broadcast information or to broadcast-related services H04H60/14
• CPC Class Codes: H04N 21/47202 : for requesting content on demand, e.g. video on demand
• CPC Class Codes: H04N 21/63345 : by transmitting keys key distribution for secret or secure communication H04L9/08; network support of key management H04L63/06
• CPC Class Codes: H04N 21/812 : involving advertisement data advertising per se G06Q30/02
• CPC Class Codes: H04N 21/835 : Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 21/8455 : involving pointers to the content, e.g. pointers to the I-frames of the video stream
• CPC Class Codes: H04N 5/783 : Adaptations for reproducing at a rate different from the recording rate
• CPC Class Codes: H04N 5/913 : for scrambling ; for copy protection
• CPC Class Codes: H04N 7/163 : by receiver means only
• CPC Class Codes: H04N 7/165 : Centralised control of user terminal subsequent to an upstream request signal H04N7/17345; Registering at central by two-way working H04N7/17309
• CPC Class Codes: H04N 7/1675 : Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58
• CPC Class Codes: H04N 7/52 : 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 assembling of a multiplex stream by combining a video stream with other content or additional data, remultiplexing of multiplex streams, insertion of stuffing bits into the multiplex stream, assembling of a packetised elementary stream at server side H04N21/236; disassembling of a multiplex stream, remultiplexing of multiplex streams, extraction or processing of Service Information, disassembling of packetised elementary stream at client side H04N21/434
• CPC Class Codes: H04N 9/7925 : for more than one standard

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. The identified segments of content are duplicated 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. A set of pointers are generated that point to the first and second encrypted segments content. 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

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.