Progressive video refresh slice detection

• US 7,292,691 B2
• Filed: 11/25/2002
• Issued: 11/06/2007
• Est. Priority Date: 01/02/2002
• 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., Derovanessian, Henry, Pedlow, JR., Leo M.
• Primary Examiner(s): Barron, Jr., Gilberto
• Assistant Examiner(s): Homayounmehr, Farid
• Application Number:
  US10/303,594
• Publication Number:
  US 20030156718A1
• Time in Patent Office: 1,807 Days
• Field of Search: 380/200, 380/212, 713/160
• US Class Current: 380/212
• CPC Class Codes: H04N 21/23476 by partially encrypting, e.g. encrypting the ending portion of a movie
• 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 21/25875 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 21/4344 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 21/43607 Interfacing a plurality of external cards, e.g. through a DVB Common Interface [DVB-CI]
• 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 7/162 Authorising the user terminal, e.g. by paying; Registering the use of a subscription channel, e.g. billing
• CPC Class Codes: H04N 7/1675 Providing digital key or authorisation information for generation or regeneration of the scrambling sequence pseudo-random number generators in general G06F7/58

Abstract

A selective encryption encoder and method of dual selective encryption and detection of intra-coded slices in video content. The selective encryption encoder has a packet identifier that identifies packets of at least one specified packet type, the at least one specified packet type being packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices. A packet duplicator duplicates the identified packets to produce first and second sets of the identified packets. The packets are sent to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method. A secondary encrypter encrypts the second set of identified packets under a second encryption method.

Claims

1. A method of partially dual encrypting a digital video signal, comprising:

examining unencrypted packets of data in the digital video signal to identify at least one specified packet type, one of the specified packet types consisting of packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices;

encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets;

encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets; and

replacing the unencrypted packets of the specified packet type with the first encrypted packets and the second encrypted packets in the digital video signal to produce a partially dual encrypted video signal.

2. The method according to claim 1, wherein the encrypting comprises encrypting packets containing slice headers for the N consecutive slices.

3. The method according to claim 1, wherein the encrypting comprises encrypting packets containing intra-coded macroblocks in the N consecutive slices.

4. The method according to claim 1, wherein the at least one specified packet type farther comprises packets containing data from a first macroblock following the video slice header in the N consecutive slices.

5. The method according to claim 1, wherein N is between 1 and 10.

6. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 1.

27. The method according to claim 1, wherein N is between 1 and 10.

7. A method of partially encrypting a digital video signal, comprising:

examining unencrypted packets of data in the digital video signal to identify at least one specified packet type, one of the specified packet types consisting of packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices;

encrypting packets identified as being of the specified packet type using a first encryption method to produce first encrypted packets; and

replacing the unencrypted packets of the specified packet type with the first encrypted packets in the digital video signal to produce a partially encrypted video signal.

8. The method according to claim 7, wherein the encrypting comprises encrypting packets containing slice headers for the N consecutive slices.

9. The method according to claim 7, wherein the encrypting comprises encrypting packets containing intra-coded macroblocks in the N consecutive slices.

10. The method according to claim 7, wherein the at least one specified packet type further comprises packets containing data from a first macroblock following the video slice header in the N consecutive slices.

11. The method according to claim 7, wherein N is between 1 and 10.

12. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 7.

13. A selective encryption encoder, comprising:

a packet identifier that identifies packets of at least one specified packet type;

a packet duplicator that duplicates the identified packets to produce first and second sets of the identified packets;

means for sending and receiving packets to and from a primary encryption encoder to encrypt the first set of identified packets under a first encryption method;

a secondary encrypter for encrypting the second set of identified packets under a second encryption method; and

wherein the packet identifier identifies packets consisting of the set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices as at least one of the specified packet types.

14. The selective encryption encoder according to claim 13, wherein the at least one specified packet type comprises packets containing slice headers for the N consecutive slices.

15. The selective encryption encoder according to claim 13, wherein the at least one specified packet type comprises packets containing intra-coded macroblocks in the N consecutive slices.

16. The selective encryption encoder according to claim 13, wherein the at least one specified packet type further comprises packets containing data from a first macroblock following the video slice header in the N consecutive slices.

17. The method according to claim 13, wherein N is between 1 and 10.

18. A television set-top box, comprising:

a receiver receiving a digital television signal comprising;

a plurality of unencrypted packets; and

a plurality of encrypted packets, wherein the encrypted packets are of at least one selected packet type and one of the selected packet types consists of packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices;

a decrypter that decrypts the encrypted packets; and

a decoder that decodes the unencrypted packets and the decrypted packets to produce a signal suitable for play on a television set.

19. The method according to claim 18, wherein N is between 1 and 10.

20. A selective encryption decoder, for decrypting and decoding a selectively encrypted digital video signal, comprising:

a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets consist of packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices;

the unenerypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);

a decrypter receiving the encrypted packets having the second PID and decrypting the encrypted packets using a first encryption method to produce decrypted packets;

a PID remapper that changes at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID; and

a decoder that decodes the unencrypted and decrypted packets to produce a decoded video signal.

21. The method according to claim 20, wherein N is between 1 and 10.

22. A method of decrypting and decoding a selectively encrypted digital video signal, comprising:

receiving packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets consist of packets in a set of N consecutive slices in a flame wherein a second byte after a slice start code is identical in all N consecutive slices;

the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);

decrypting the encrypted packets having the second PID to produce decrypted packets;

remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID; and

decoding the unencrypted and decrypted packets to produce a decoded video signal.

23. A computer readable medium carrying instructions which, when executed on a programmed processor, carry out the method of decoding and decrypting a digital video signal according to claim 22.

24. The method according to claim 22, wherein N is between 1 and 10.

25. A computer readable medium that carries instructions that when executed on a programmed processor to facilitate operation of a video receiver device to decrypt and decode a selectively encoded digital video signal wherein the instructions comprise:

a code segment that controls a demultiplexer that receives packets of digital video, certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets consist of packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices, the unencrypted packets having a first packet identifier (PID) and the encrypted packets having a second packet identifier (PID);

a code segment that controls decryption of the encrypted packets to produce decrypted packets;

a code segment that controls remapping at least one of the first and second PIDs so that the unencrypted packets and the decrypted packets have the same PID; and

a code segment that controls decoding the unencrypted and decrypted packets to produce a decoded video signal.

26. The computer readable medium of claim 25, wherein the medium comprises an electronic storage medium.

28. A selectively encrypted digital video signal embodied in a computer readable medium, comprising:

a sequence of packets of video data, wherein the sequence of packets when not encrypted represent a segment of video content;

wherein certain of the packets are unencrypted;

wherein certain of the packets have been produced by decrypting encrypted packets;

wherein certain of the decrypted packets consist of packets in a set of N consecutive slices in a frame wherein the a second byte after a slice start code is identical in all N consecutive slices; and

a segment of code that identifies the unencrypted packets by a first packet identifier (PID); and

a segment of code that identifies the encrypted packets by a second packet identifier (PID).

29. The method according to claim 28, wherein N is between 1 and 10.

30. A method of detecting intra-coded slices, without regard for any slice header data, in a progressive refresh frame of video data that uses P Frames to encode progressively refreshed intracoded slices, comprising:

reading a specified byte value in a plurality of adjacent slices of a frame of the progressive refresh video data, wherein said specified byte value excluding slice header data and wherein the specified byte value consists of a second byte after a slice start code;

comparing the specified byte values in a plurality of adjacent slices; and

detennining that the adjacent slices are intra-coded slices if the specified byte values are the same in the plurality of adjacent slices.

31. The method according to claim 30, embodied in a synchronous state machine.

32. The method according to claim 30, wherein the plurality of adjacent slices comprises N adjacent slices.

33. The method according to claim 30, further comprising:

duplicating the intra-coded slices to create duplicate intra-coded slices; and

dual encrypting the duplicate intra-coded slices under first and second encryption methods.

34. The method according to claim 33, wherein the dual encrypting comprises dual encrypting packets containing slice headers intra-coded slices.

35. The method according to claim 33, wherein the dual encrypting comprises dual encrypting packets containing intra-coded macroblocks intra-coded slices.

36. The method according to claim 33, wherein the dual encrypting comprises dual encrypting packets containing data from a first macroblock following the video slice header in the intra-coded slices.

37. The method according to claim 30, further comprising encrypting the intra-coded slices.

38. The method according to claim 37, wherein the encrypting comprises encrypting packets containing slice headers intra-coded slices.

39. The method according to claim 37, wherein the encrypting comprises encrypting packets containing intra-coded macroblocks intra-coded slices.

40. The method according to claim 37, wherein the encrypting comprises encrypting packets containing data from a first macroblock following the video slice header in the intra-coded slices.

41. The method according to claim 30, wherein N is between 1 and 10.

42. A computer readable medium storing instructions which, when executed on a programmed processor, carry out the method of encrypting a digital video signal according to claim 30.

43. The computer readable medium of claim 42, wherein the medium comprises an electronic storage medium.

44. A method of detecting intra-coded slices in a progressive refresh frame of video datn that uses P Frames to encode progressively refreshed intracoded slices, comprising:

reading a second byte following a slice start code in a plurality of adjacent slices of a frame of the progressive refresh video data;

comparing the second byte following the slice start code values in N adjacent slices; and

determining that the N adjacent slices are intra-coded slices if the values are the same in the N adjacent slices.

45. The method according to claim 44, embodied in a synchronous state machine.

46. The method according to claim 44, wherein N+3.

47. The method according to claim 46, wherein the N adjacent slices begin with slice number 1, 4, 7, . . . , 28 in a thirty slice frame.

48. The method according to claim 44, further comprising:

duplicating the intra-coded slices to create duplicate intra-coded slices; and

dual encrypting the duplicate intra-coded slices under first and second encryption methods.

49. The method according to claim 44, further comprising encrypting the intra-coded slices.

50. The method according to claim 44, wherein N is between 1 and 10.