CA2413807A1 - Progressive video refresh slice detection - Google Patents

Progressive video refresh slice detection Download PDF

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Publication number
CA2413807A1
CA2413807A1 CA002413807A CA2413807A CA2413807A1 CA 2413807 A1 CA2413807 A1 CA 2413807A1 CA 002413807 A CA002413807 A CA 002413807A CA 2413807 A CA2413807 A CA 2413807A CA 2413807 A1 CA2413807 A1 CA 2413807A1
Authority
CA
Canada
Prior art keywords
packets
slices
encrypted
encrypting
video signal
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
CA002413807A
Other languages
French (fr)
Other versions
CA2413807C (en
Inventor
Brant L. Candelore
Henry Derovanessian
Leo M. Jr. Pedlow
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Electronics Inc
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from US10/038,032 external-priority patent/US7139398B2/en
Priority claimed from US10/273,905 external-priority patent/US7376233B2/en
Priority claimed from US10/303,594 external-priority patent/US7292691B2/en
Application filed by Individual filed Critical Individual
Priority to CA 2709393 priority Critical patent/CA2709393C/en
Publication of CA2413807A1 publication Critical patent/CA2413807A1/en
Application granted granted Critical
Publication of CA2413807C publication Critical patent/CA2413807C/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
    • H04N7/00—Television systems
    • H04N7/16—Analogue secrecy systems; Analogue subscription systems
    • H04N7/167—Systems rendering the television signal unintelligible and subsequently intelligible
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/234—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs
    • H04N21/2347—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption
    • H04N21/23476—Processing of video elementary streams, e.g. splicing of video streams, manipulating MPEG-4 scene graphs involving video stream encryption by partially encrypting, e.g. encrypting the ending portion of a movie
    • 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]
    • H04N21/20—Servers specifically adapted for the distribution of content, e.g. VOD servers; Operations thereof
    • H04N21/23—Processing of content or additional data; Elementary server operations; Server middleware
    • H04N21/236—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
    • H04N21/23608—Remultiplexing multiplex streams, e.g. involving modifying time stamps or remapping the packet identifiers

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

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 (60)

1. A method of partially dual encrypting a digital video signal, comprising:
examining unencrypted packets of data in the digital video signal to identity at least one specified packet type, the at least one specified packet type comprising 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 further 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.
7. The computer readable medium of claim 6, wherein the medium comprises one of an electronic storage medium and a carrier wave.
8. An electronic transmission medium carrying an encrypted digital video signal encrypted by the method according to claim 1.
9. 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, the at least one specified packet type comprising 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.
10. The method according to claim 9, wherein the encrypting comprises encrypting packets containing slice headers for the N consecutive slices.
11. The method according to claim 9, wherein the encrypting comprises encrypting packets containing intra-coded macroblocks in the N consecutive slices.
12. The method according to claim 9, 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.
13. The method according to claim 9, wherein N is between 1 and 10.
14. 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 8.
75. The computer readable medium of claim 14, wherein the medium comprises one of an electronic storage medium and a carrier wave.
16. An electronic transmission medium carrying an encrypted digital video signal encrypted by the method according to claim 9.
17. 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 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.
18. The selective encryption encoder according to claim 17, wherein the at least one specified packet type comprises packets containing slice headers for the N consecutive slices.
19. The selective encryption encoder according to claim 17, wherein the at least one specified packet type comprises packets containing intra-coded macroblocks in the N consecutive slices.
20. The selective encryption encoder according to claim 17, 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.
21. The method according to claim 17, wherein N is between 1 and 10.
22. 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 the at feast one specified packet type comprising 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.
23. The method according to claim 22, wherein N is between 1 and 10.
24. 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 comprise 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 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.
25. The method according to claim 24, wherein N is between 1 and 10.
26. 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 comprise 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);
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.
27. 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 26.
28. The computer readable medium of claim 27, wherein the medium comprises one of an electronic storage medium and a carrier wave.
29. An electronic transmission medium carrying a digital video signal decoded and decrypted by the method according to claim 26.
30. The method according to claim 26, wherein N is between 1 and 10.
31. 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 comprise 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.
32. The computer readable medium of claim 31, wherein the medium comprises one of an electronic storage medium and a carrier wave.
33. The method according to claim 1, wherein IV is between 1 and 10.
34. A selectively encrypted digital video signal embodied in a carrier wave, comprising:
a stream of packets of video data, wherein the stream of packets when not encrypted represent a segment of video content;
certain of the packets being unencrypted and certain of the packets being encrypted, wherein certain of the encrypted packets comprise 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 first segment of code that identifies the unencrypted packets by a first packet identifier (PID); and a second segment of code that identifies the encrypted packets by a second packet identifier (PID).
35. The method according to claim 34, wherein N is between 1 and 10.
36. 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 comprise 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).
37. The method according to claim 36, wherein N is between 1 and 10.
38. A method of detecting intra-coded slices in a progressive refresh frame of video data, comprising:
reading a macroblock byte value in a plurality of adjacent slices of a frame of video data;
comparing the macroblock byte values in a the plurality of adjacent slices; and determining that the adjacent slices are intra-coded slices if the macroblock byte values are the same in the plurality of adjacent slices.
39. The method according to claim 38, embodied in a synchronous state machine.
40. The method according to claim 38, wherein the plurality of adjacent slices comprises N adjacent slices.
41. The method according to claim 38, wherein the macroblock byte value comprises a second byte after a slice start code.
42. The method according to claim 38, 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.
43. The method according to claim 42, wherein the dual encrypting comprises dual encrypting packets containing slice headers intra-coded slices.
44. The method according to claim 42, wherein the dual encrypting comprises dual encrypting packets containing infra-coded macroblocks intra-coded slices.
45. The method according to claim 42, wherein the dual encrypting comprises dual encrypting packets containing data from a first macroblock following the video slice header in the intra-coded slices.
46. The method according to claim 38, further comprising encrypting the intra-coded slices.
47. The method according to claim 46, wherein the encrypting comprises encrypting packets containing slice headers intra-coded slices.
48. The method according to claim 46, wherein the encrypting comprises encrypting packets containing intra-coded macroblocks intra-coded slices.
49. The method according to claim 46, wherein the encrypting comprises encrypting packets containing data from a first macroblock following the video slice header in the intra-coded slices.
50. The method according to claim 38, wherein N is between 1 and 10.
51. 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 38.
52. The computer readable medium of claim 51, wherein the medium comprises one of an electronic storage medium and a carrier wave.
53. An electronic transmission medium carrying an encrypted digital video signal encrypted by the method according to claim 38.
54. A method of detecting intro-coded slices in a progressive refresh frame of video data, comprising:
reading a second byte following a slice start code in a plurality of adjacent slices of a frame of video data;
comparing the second byte following the slice start code values in N
adjacent slices; and determining that the N adjacent slices are intro-coded slices if the values are the same in the N adjacent slices.
55. The method according to claim 54, embodied in a synchronous state machine.
56. The method according to claim 54, wherein N=3.
57. The method according to claim 56, wherein the N adjacent slices begin with slice number 1, 4, 7,..., 28 in a thirty slice frame.
58. The method according to claim 54, further comprising:
duplicating the infra-coded slices to create duplicate intro-coded slices;
and dual encrypting the duplicate intro-coded slices under first and second encryption methods.
59. The method according to claim 54, further comprising encrypting the intro-coded slices.
60. The method according to claim 54, werein N is between 1 and 10.
CA 2413807 2002-01-02 2002-12-10 Progressive video refresh slice detection Expired - Lifetime CA2413807C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA 2709393 CA2709393C (en) 2002-01-02 2002-12-10 Progressive video refresh slice detection

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
US10/037,498 2002-01-02
US10,038,032 2002-01-02
US10/038,032 US7139398B2 (en) 2001-06-06 2002-01-02 Time division partial encryption
US10/038,217 US7336787B2 (en) 2001-06-06 2002-01-02 Critical packet partial encryption
US10/037,498 US7127619B2 (en) 2001-06-06 2002-01-02 Decoding and decryption of partially encrypted information
US10/037,914 2002-01-02
US10,038,217 2002-01-02
US10/037,499 US7151831B2 (en) 2001-06-06 2002-01-02 Partial encryption and PID mapping
US10/037,914 US7124303B2 (en) 2001-06-06 2002-01-02 Elementary stream partial encryption
US10/037,499 2002-01-02
US40967502P 2002-09-09 2002-09-09
US60/409,675 2002-09-09
US10/273,905 2002-10-18
US10/273,905 US7376233B2 (en) 2002-01-02 2002-10-18 Video slice and active region based multiple partial encryption
US10/303,594 2002-11-25
US10/303,594 US7292691B2 (en) 2002-01-02 2002-11-25 Progressive video refresh slice detection

Related Child Applications (1)

Application Number Title Priority Date Filing Date
CA 2709393 Division CA2709393C (en) 2002-01-02 2002-12-10 Progressive video refresh slice detection

Publications (2)

Publication Number Publication Date
CA2413807A1 true CA2413807A1 (en) 2003-07-02
CA2413807C CA2413807C (en) 2011-08-16

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Family Applications (2)

Application Number Title Priority Date Filing Date
CA 2709393 Expired - Lifetime CA2709393C (en) 2002-01-02 2002-12-10 Progressive video refresh slice detection
CA 2413807 Expired - Lifetime CA2413807C (en) 2002-01-02 2002-12-10 Progressive video refresh slice detection

Family Applications Before (1)

Application Number Title Priority Date Filing Date
CA 2709393 Expired - Lifetime CA2709393C (en) 2002-01-02 2002-12-10 Progressive video refresh slice detection

Country Status (1)

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CA (2) CA2709393C (en)

Also Published As

Publication number Publication date
CA2413807C (en) 2011-08-16
CA2709393A1 (en) 2003-07-02
CA2709393C (en) 2013-07-02

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Effective date: 20221212