Time division partial encryption

• US 7,751,560 B2
• Filed: 06/26/2006
• Issued: 07/06/2010
• Est. Priority Date: 06/06/2001
• Status: Expired due to Fees

• 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: Derovanessian, Henry, Unger, Robert Allan, Candelore, Brant L.
• Primary Examiner(s): Song, Hosuk
• Application Number:
  US11/474,550
• Publication Number:
  US 20060262926A1
• Time in Patent Office: 1,471 Days
• Field of Search: 380200-203, 380217-218, 380/241, 713160-163, 713/189, 705 57- 59, 725/25, 725 30- 31, 725/87
• US Class Current: 380/200
• 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 21/23608 Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/2362 Generation or processing of Service Information [SI]
• CPC Class Codes: H04N 21/2365 Multiplexing of several video streams
• CPC Class Codes: H04N 21/23897 by partially encrypting, e.g. encrypting only the ending portion of a movie
• CPC Class Codes: H04N 21/25875 involving end-user authentication restricting access to computer systems by authenticating users using a predetermined code G06F21/33; arrangements for secret or secure communication including means for verifying the identity or authority of a user of the system H04L9/32; networks authentication protocols H04L63/08; authentication in wireless network security H04W12/06
• 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 21/4181 for conditional access
• CPC Class Codes: H04N 21/42615 involving specific demultiplexing arrangements
• CPC Class Codes: H04N 21/4344 Remultiplexing of multiplex streams, e.g. by modifying time stamps or remapping the packet identifiers
• CPC Class Codes: H04N 21/4345 Extraction or processing of SI, e.g. extracting service information from an MPEG stream
• CPC Class Codes: H04N 21/4347 Demultiplexing of several video streams
• 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 21/43853 involving multiplex stream decryption arrangements using cryptography for the use of broadcast information or broadcast-related information H04H60/23
• CPC Class Codes: H04N 21/43856 by partial decryption, e.g. decrypting a multiplex stream that has been partially encrypted
• CPC Class Codes: H04N 21/44055 by partially decrypting, e.g. decrypting a video stream that has been partially encrypted
• CPC Class Codes: H04N 21/4516 involving client characteristics, e.g. Set-Top-Box type, software version or amount of memory available
• CPC Class Codes: H04N 21/454 Content or additional data filtering, e.g. blocking advertisements
• 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 21/835 : Generation of protective data, e.g. certificates protecting software against unauthorised usage in a vending or licensing environment G06F21/10
• CPC Class Codes: H04N 7/162 : Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
• CPC Class Codes: H04N 7/167 : Systems rendering the television signal unintelligible and subsequently intelligible
• 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

Abstract

A method of processing digital content consistent with certain embodiments involves receiving a signal containing the digital content, wherein the digital content has a first encrypted sample of the digital content, the sample being encrypted under a first encryption method, a second encrypted sample of the digital content, the sample being encrypted under a second encryption method, and an unencrypted portion; and decrypting the first encrypted sample to produce a decrypted sample. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

Claims

1. A method of producing a partially multiple encrypted television signal, comprising:

generating a first encrypted sample of the television signal, the first encrypted sample comprising a first sample encrypted under a first encryption method;

generating a second encrypted sample of the television signal, the second encrypted sample comprising the first sample encrypted under a second encryption method; and

at a multiplexing device, combining the first and second encrypted samples with an unencrypted portion to produce the partially multiple encrypted television signal.

2. The method of producing a partially multiple encrypted television signal according to claim 1, wherein the television signal comprises a digital television signal, and wherein the first encrypted samples and second encrypted samples comprise first encrypted packets and second encrypted packets, and the unencrypted portion comprises unencrypted packets.

3. The method of producing a partially multiple encrypted television signal according to claim 2, wherein the digital television signal complies with an MPEG standard, and wherein the first encrypted packets are identified by a first packet identifier, and wherein the second encrypted packets are identified by a second packet identifier.

4. A method of multiple encrypting an unencrypted television program, comprising:

encrypting N portions of the television program out of every M portions of the television program according to a first encryption method, where M is greater than N, to create a first encrypted portion;

encrypting the N portions of the television program out of every M portions of the television program according to a second encyption method, where M is greater than N, to create a second encrypted portion; and

leaving a remainder of the television program unencrypted, wherein the combination of the first encrypted portion with the second encrypted portion and the remainder comprises a multiple partially encrypted television program.

5. The method according to claim 4, further comprising distributing the multiple partially encrypted television program over one of the following:

a terrestrial broadcast system, a cable television system and a satellite television system.

6. The method according to claim 4, further comprising assigning a packet identifier (PID) to data packets containing the first encrypted portions and the remainder of the television program, the packet identifier associating the first encrypted portion and the remainder with the television program.

7. The method according to claim 4, further comprising assigning a primary packet identifier (PID) to data packets containing the first encrypted portions and the remainder of the television program, the packet identifier associating the first encrypted portion and the remainder with the television program;

and assigning a secondary packet identifier (PID) to data packets containing the second encrypted portions of each television program, the secondary packet identifier associating the second encrypted samples with the television program.

8. The method according to claim 4, wherein the N portions comprise N frames of video.

9. An electronic storage medium storing instructions which, when executed on a programmed processor, carry out the method according to claim 4.

10. An electronic transmission medium carrying a multiple encrypted television program encrypted by the method according to claim 4.

11. A method of processing a television signal, comprising:

receiving a television signal comprising;

a first encrypted sample of the television program, the sample being encrypted under a first encryption method,

a second encrypted sample of the television program, the sample being encrypted under a second encryption method, and

an unencrypted portion; and

decrypting the first encrypted sample to produce a decrypted sample.

12. The method according to claim 11, further comprising decoding the unencrypted portion and the decrypted sample.

13. The method according to claim 11, wherein the television signal is a digital television signal, and wherein the first encrypted samples and second encrypted samples comprise first encrypted packets and second encrypted packets, and the unencrypted portion comprises unencrypted packets.

14. The method according to claim 11, wherein the digital television signal complies with an MPEG standard, and wherein the first encrypted packets are identified by a first packet identifier, and wherein the second encrypted packets are identified by a second packet identifier.

15. The method according to claim 11, carried out in a television device.

16. The method according to claim 11, carried out in a television set-top box.

17. The method according to claim 11, carried out in an integrated circuit.

18. The method according to claim 11, carried out in one of an application specific integrated circuit, a programmable logic device and a field programmable gate array.

19. A method of processing digital content, comprising:

receiving a signal containing the digital content, the digital content comprising;

a first encrypted sample of the digital content, the sample being encrypted under a first encryption method,

a second encrypted sample of the digital content, the sample being encrypted under a second encryption method, and

an unencrypted portion; and

decrypting the first encrypted sample to produce a decrypted sample.

20. The method according to claim 19, further comprising decoding the unencrypted portion and the decrypted sample.

21. The method according to claim 19, carried out in one of an integrated circuit, an application specific integrated circuit and a field programmable gate array.

22. The method according to claim 19, carried out in one of a television device, a content player, a PDA and a music player.

23. A television set-top box for decoding a television signal, comprising:

a receiver that receives a television signal having;

a first encrypted sample of the television program, the sample being encrypted under a first encryption method,

a second encrypted sample of the television program, the sample being encrypted under a second encryption method, and

an unencrypted portion;

a decrypter that decrypts the first encrypted sample to produce a decrypted sample; and

a decoder that decodes the unencrypted portion and the decrypted sample.

24. The apparatus according to claim 23, wherein the television signal is a digital television signal, and wherein the first encrypted samples and second encrypted samples comprise first encrypted packets and second encrypted packets, and the unencrypted portion comprises unencrypted packets.

25. The apparatus according to claim 24, wherein the digital television signal complies with an MPEG standard, and wherein the first encrypted packets are identified by a first packet identifier, and wherein the second encrypted packets are identified by a second packet identifier.

26. A method of producing a partially multiple encrypted television signal, comprising:

generating a first encrypted sample of the television signal, the first encrypted sample comprising a first sample encrypted under a first encryption method;

generating a second encrypted sample of the television signal, the second encrypted sample comprising the first sample encrypted under a second encryption method; and

at a multiplexing device, combining the first and second encrypted samples with an unencrypted portion to produce the partially multiple encrypted television signal,

wherein the television signal comprises a digital television signal, and wherein the first encrypted samples and second encrypted samples comprise first encrypted packets and second encrypted packets, and the unencrypted portion comprises unencrypted packets, and

wherein the digital television signal complies with an MPEG standard, and wherein the unencrypted packets are identified by a first packet identifier, and wherein the first encrypted packets are identified by the first packet identifier, and wherein the second encrypted packets are identified by a second packet identifier.

27. A method of processing a television signal, comprising:

receiving a television signal comprising;

a first encrypted sample of the television program, the sample being encrypted under a first encryption method,

a second encrypted sample of the television program, the sample being encrypted under a second encryption method, and

an unencrypted portion; and

decrypting the first encrypted sample to produce a decrypted sample,

wherein the digital television signal complies with an MPEG standard, and wherein the unencrypted packets are identified by a first packet identifier, and wherein the first encrypted packets are identified by the first packet identifier, and wherein the second encrypted packets are identified by a second packet identifier.

28. A television set-top box for decoding a television signal, comprising:

a receiver that receives a television signal having;

a first encrypted sample of the television program, the sample being encrypted under a first encryption method,

a second encrypted sample of the television program, the sample being encrypted under a second encryption method, and

an unencrypted portion;

a decrypter that decrypts the first encrypted sample to produce a decrypted sample; and

a decoder that decodes the unencrypted portion and the decrypted sample,

wherein the television signal is a digital television signal, and wherein the first encrypted samples and second encrypted samples comprise first encrypted packets and second encrypted packets, and the unencrypted portion comprises unencrypted packets, and

wherein the digital television signal complies with an MPEG standard, and wherein the unencrypted packets are identified by a first packet identifier, and wherein the first encrypted packets are identified by the first packet identifier, and wherein the second encrypted packets are identified by a second packet identifier.