Star pattern partial encryption method

• US 7,751,564 B2
• Filed: 03/05/2007
• Issued: 07/06/2010
• Est. Priority Date: 01/02/2002
• 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: Pedlow, JR., Leo M., Candelore, Brant L., Derovanessian, Henry
• Primary Examiner(s): Moazzami, Nasser
• Assistant Examiner(s): YALEW, FIKREMARIAM A
• Application Number:
  US11/713,848
• Publication Number:
  US 20070160210A1
• Time in Patent Office: 1,219 Days
• Field of Search: 380/239, 380/210, 380/200
• US Class Current: 380/239
• CPC Class Codes: H04K 1/00 Secret communication
• CPC Class Codes: H04L 2209/60 Digital content management, e.g. content distribution
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 9/14 using a plurality of keys or algorithms
• CPC Class Codes: H04N 21/23897 by partially encrypting, e.g. encrypting only the ending portion of a movie
• 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

In certain embodiments, a method of partially dual encrypting a digital video signal involves examining unencrypted packets of data in the digital video signal to identify a specified packet type. The specified packet type includes packets occurring in a star pattern approximately situated at approximately a center of an image; 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. This abstract should not be considered limiting since embodiments consistent with the present invention may involve more, different or fewer elements.

Claims

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

examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets occurring in a star pattern situated within an image;

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

at a multiplexer, 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 specified packet type further comprises packets containing an intra-coded macroblock within the star pattern.

3. The method according to claim 2, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:

macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.

4. The method according to claim 2, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:

macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.

5. The method according to claim 2, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:

macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.

6. The method according to claim 1, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:

macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.

7. The method according to claim 1, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:

macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.

8. The method according to claim 1, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:

macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.

9. The method according to claim 1, wherein the star pattern is centered above a true center of the image.

10. The method according to claim 1, wherein the star pattern has rays extending horizontally across a full width of the image.

11. The method according to claim 1, wherein the star pattern has rays extending vertically across a full height of the image.

12. The method according to claim 1, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.

13. A tangible non-transitory 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.

14. The tangible non-transitory computer readable medium of claim 13, wherein the medium comprises an electronic storage medium.

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

examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets occurring in a star pattern;

wherein the specified packet type further comprises packets containing an intra-coded macroblock within the star pattern and wherein the star pattern is centered above a true center of the image;

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.

16. The method according to claim 15, further comprising encrypting the packets identified as being of the specified packet type using a second encryption method to produce second encrypted packets;

and

inserting the second encrypted packets into the digital video signal to produce a dual partially encrypted video signal.

17. The method according to claim 15, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:

macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.

18. The method according to claim 15, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:

macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.

19. The method according to claim 15, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:

macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.

20. The method according to claim 15, wherein the star pattern has rays extending horizontally across a full width of the image.

21. The method according to claim 15, wherein the star pattern has rays extending vertically across a full height of the image.

22. The method according to claim 15, wherein the star pattern has a rectangular central region centered approximately one slice above a center of the image.

23. A tangible non-transitory 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 15.

24. The tangible non-transitory computer readable medium of claim 23, wherein the medium comprises an electronic storage medium.

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

examining unencrypted packets of data in the digital video signal to identify a specified packet type, the specified packet type comprising packets occurring in a star pattern approximately situated at an upper center of an image, and containing an intra-coded macroblock, the star pattern being centered above a true center of the image and having rays extending horizontally and vertically across a full width and height of the image respectively, the star pattern further having a rectangular central portion centered approximately one slice above a center of the image;

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

at a multiplexer, 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.

26. The method according to claim 25, wherein a video frame comprises 30 slices each having 33 macroblocks, and wherein the star pattern is defined by:

macroblocks 14-21 in slices 1-6 and 22-30, macroblocks 11-23 of slices 7-12 and 19-21 and macroblocks 1-33 of slices 13-18.

27. The method according to claim 25, wherein a video frame comprises 45 slices each having 80 macroblocks, and wherein the star pattern is defined by:

macroblocks 34-51 in slices 1-9 and 32-45, macroblocks 26-56 of slices 10-18 and 28-31 and macroblocks 1-80 of slices 19-27.

28. The method according to claim 25, wherein a video frame comprises 68 slices each having 120 macroblocks, and wherein the star pattern is defined by:

macroblocks 50-77 in slices 1-12 and 49-60, macroblocks 40-84 of slices 13-27 and 42-48 and macroblocks 1-120 of slices 28-41.

29. A tangible non-transitory 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 25.

30. The tangible non-transitory computer readable medium of claim 29, wherein the medium comprises an electronic storage medium.