CA2496137A1 - Improvements in or relating to the copy protection of optical discs - Google Patents

Improvements in or relating to the copy protection of optical discs Download PDF

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Publication number
CA2496137A1
CA2496137A1 CA002496137A CA2496137A CA2496137A1 CA 2496137 A1 CA2496137 A1 CA 2496137A1 CA 002496137 A CA002496137 A CA 002496137A CA 2496137 A CA2496137 A CA 2496137A CA 2496137 A1 CA2496137 A1 CA 2496137A1
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CA
Canada
Prior art keywords
data
unreadable
disc according
content
subversive
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
CA002496137A
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French (fr)
Other versions
CA2496137C (en
Inventor
Carmen Laura Basile
Jonny Boyd Reckless
Lee Avery
Glenn Allen Siebert
Kordian Jacek Kurowski
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Adeia Solutions LLC
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Individual
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Publication of CA2496137A1 publication Critical patent/CA2496137A1/en
Application granted granted Critical
Publication of CA2496137C publication Critical patent/CA2496137C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/10—Digital recording or reproducing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B27/00—Editing; Indexing; Addressing; Timing or synchronising; Monitoring; Measuring tape travel
    • G11B27/02—Editing, e.g. varying the order of information signals recorded on, or reproduced from, record carriers
    • G11B27/031—Electronic editing of digitised analogue information signals, e.g. audio or video signals
    • G11B27/034—Electronic editing of digitised analogue information signals, e.g. audio or video signals on discs
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/00572—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium
    • G11B20/00579—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which change the format of the recording medium said format change concerning the data encoding, e.g., modulation schemes violating run-length constraints, causing excessive DC content, or involving uncommon codewords or sync patterns
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B20/00—Signal processing not specific to the method of recording or reproducing; Circuits therefor
    • G11B20/00086—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy
    • G11B20/0092—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors
    • G11B20/00927—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving measures which are linked to media defects or read/write errors wherein said defects or errors are generated on purpose, e.g. intended scratches
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B2220/00—Record carriers by type
    • G11B2220/20—Disc-shaped record carriers
    • G11B2220/25—Disc-shaped record carriers characterised in that the disc is based on a specific recording technology
    • G11B2220/2537—Optical discs
    • G11B2220/2562—DVDs [digital versatile discs]; Digital video discs; MMCDs; HDCDs

Abstract

Generally the more effective is the copy protection provided on an optical disc, such as a DVD, the greater is the likelihood that the copy protection will adversely interfere with legitimate uses of the optical disc.
It is therefore proposed to include at least one region of subversive data within the content in the data area of an optical disc, and then to prevent access to each such region of subversive data during normal playback of the disc. For a DVD, the subversive data may be incorporated within video objects and/or may be in gaps between files in the DVD_Video zone. It is arranged that there are no navigable paths to the regions of subversive data.

Claims (75)

1. A copy protected optical disc carrying content and control data in a data area, the content being arranged in one or more content files, and the control data providing access to the content, wherein at least one region which contains unreadable or subversive data is provided within the data area, and wherein access to the or each region of unreadable or subversive data is prevented during normal playback of the content on the disc.
2. A copy protected optical disc according to Claim 1, wherein at least one region of unreadable or subversive data is formed within an individual content file.
3. A copy protected optical disc according to Claim 1, wherein at least one region of unreadable or subversive data is formed between content files.
4. A copy protected optical disc according to Claim 3, wherein at least one region of unreadable or subversive data is formed as a gap between two adjacent content files.
5. A copy protected optical disc according to Claim 1, wherein the content files are video object files and are composed of video objects (VOBs) which are divided into cells, and wherein the cells can be accessed by respective pointers in a program chain.
6. A copy protected optical disc according to Claim 5, wherein at least one region of unreadable or subversive data is. formed as an additional cell within a video object.
7. A copy protected optical disc according to Claim 6, wherein there are no pointers accessing the at least one region of unreadable or subversive data.
8. A copy protected optical disc according to Claim 6, wherein there are pointers accessing at least one region of unreadable or subversive data but programs defined by said control data are altered such that the unreadable or subversive data is not accessed during normal playback of the content of the disc.
9. A copy protected optical disc according to Claim 5, wherein at least one region of unreadable or subversive data is formed as an unstructured region within a video object or between video objects.
10. A copy protected optical disc according to Claim 9, wherein there are no pointers accessing the at least one region of unreadable or subversive data.
11. A copy protected optical disc according to Claim 9, wherein there are pointers accessing the at least one region of unreadable or subversive data but program chains defined by said control data are altered such that the unreadable or subversive data is not accessed during normal playback of the content of the disc.
12. A copy protected optical disc according to Claim 5, wherein at least one region of unreadable or subversive data is formed in an existing cell within a video object.
13. A copy protected optical disc according to Claim 5, wherein at least one region of unreadable or subversive data is formed in a video object which is interleaved with existing content.
14. A copy protected optical disc according to Claim 13, wherein there are no pointers accessing the at least one region of unreadable or subversive data.
15. A copy protected optical disc according to Claim 13, wherein there are pointers accessing at least one region of unreadable or subversive data but program chains defined by said control data are altered such that the unreadable or subversive data is not accessed during normal playback of the content of the disc.
16. A copy protected optical disc according to Claim 1, wherein the or each region of unreadable or subversive data contains both buffering data and subversive data.
17. A copy protected optical disc according to Claim 16, wherein the or each region contains buffering data followed by subversive data.
18. A copy protected optical disc according to Claim 16, wherein the or each region contains buffering data following the subversive data.
19. A copy protected optical disc according to Claim 16, wherein said buffering data has non-subversive properties.
20. A copy protected optical disc according to Claim 1, wherein said unreadable or subversive data includes or comprises data patterns chosen to cause DSV problems.
21. A copy protected optical disc according to Claim 20, wherein said data patterns have been chosen to ensure that the DSV has a significant absolute value.
22. A copy protected optical disc according to Claim 20, wherein said data patterns have been chosen to produce a DSV which has a rapid rate of change.
23. A copy protected optical disc according to Claim 1, wherein said unreadable or subversive data has incorrect control data associated therewith.
24. A copy protected optical disc according to Claim 23, wherein said incorrect control data associated with the unreadable or subversive data comprises incorrect error correcting codes.
25. A copy protected optical disc according to Claim 1, wherein said unreadable or subversive data includes or has mistimed waveform transitions.
26. A copy protected optical disc according to Claim 1, wherein said unreadable or subversive data includes or comprises bits or sectors which have been mechanically or physically damaged.
27. A copy protected optical disc according to Claim 1, wherein said unreadable or subversive data includes or comprises information bits or sectors of information bits whose information content has been rendered incorrect.
28. A copy protected optical disc carrying content and control data in a data area, the content being arranged in one or more content files, and the control data providing access to the content, wherein at least one region which contains unreadable or subversive data is provided within the data area, and wherein access to the or each region of unreadable or subversive data is prevented during normal playback of the content on disc, and wherein at least one region of unreadable or subversive data is formed as a gap between two adjacent content files.
29. A copy protected optical disc according to Claim 28, wherein said content files are files within a DVD-Video None and said gap is formed between two adjacent files within said zone.
30. A copy protected optical disc according to Claim 28, wherein the control data does not provide navigable paths to said gap between the content files.
31. A copy protected optical disc according to Claim 28, wherein the or each region of unreadable or subversive data contains both buffering data and subversive data.
32. A copy protected optical disc according to Claim 28, wherein said unreadable or subversive data includes or comprises data patterns chosen to cause DSV problems.
33. A method of copy protecting an optical disc carrying content and control data in a data area, wherein the content is arranged in one or more content files, and the control data provides access to the content, the method comprising the steps of:
providing at least one region within the data area containing unreadable or other subversive data, and arranging that the or each region of unreadable or subversive data is not accessed during normal playback of the content on the disc.
34. A method of copy protecting an optical disc according to Claim 33, wherein at least one region of unreadable or subversive data is formed within an individual content file.
35. A method of copy protecting an optical disc according to Claim 33, wherein at least one region of unreadable or subversive data is formed between content files.
36. A method of copy protecting an optical disc according to Claim 33, wherein at least one region of unreadable or subversive data is formed as a gap between two adjacent content files.
37. A method of copy protecting an optical disc according to Claim 33, wherein the content files are video object files which are composed of video objects (VOBs) which are divided into cells, and wherein the cells can be accessed by respective pointers in a program chain.
38. A method of copy protecting an optical disc according to Claim 37, further comprising forming at least one rection of unreadable or subversive data as an additional cell within a video object.
39. A method of copy protecting an optical disc according to Claim 37, further comprising forming at least one region of unreadable or subversive data as an unstructured region within a video object or between video objects.
40. A method of copy protecting an optical disc according to Claim 37, further comprising forming at least one rection of unreadable or subversive data in an existing cell within a video object.
41. A method of copy protecting an optical disc according to Claim 37, further comprising forming at least one rection of unreadable or subversive data within a video object which is interleaved with existing content.
42. A method of copy protecting an optical disc according to Claim 33, further comprising arranging that there are no pointers accessing the at least one region of unreadable or subversive data.
43. A method of copy protecting an optical disc according to Claim 33, wherein there are pointers accessing the at least one region of unreadable or subversive data, and the method comprising altering program chains defined by said control data such that the unreadable or subversive data is not accessed during normal playback of the content on the disc.
44. A method of copy protecting an opt cal disc according to Claim 33, wherein both buffering data and subversive data are provided within the or each region of unreadable or subversive data.
45. A method of copy protecting an opt cal disc according to Claim 44, further comprising forming the subversive data in the or each region so that it is surrounded by buffering data.
46. A method of copy protecting an opt cal disc according to Claim 33, further comprising including data patterns, which have been chosen to cause DSV problems, in a region of the data area to provide the unreadable or subversive data
47. A method of copy protecting an optical disc according to Claim 46, wherein said data patterns have been chosen to ensure that the DSV has a significant absolute value.
48. A method of copy protecting an optical disc according to claim 46, wherein said data patterns have been chosen to produce a DSV which has a rapid rate of change.
49. A method of copy protecting an optical disc according to Claim 33, further comprising rendering control data in a region of the data area incorrect to provide the unreadable or subversive data.
50. A method of copy protecting an optical disc according to Claim 49, wherein said incorrect control data associated with the unreadable or subversive data comprises incorrect error correcting codes.
51. A method of copy protecting an optical disc according to Claim 33, further comprising including mistimed waveform transitions in data in a region of the data area to provide the unreadable or subversive data.
52. A method of copy protecting an optical disc according to Claim 33, further comprising mechanically or physically damaging bits or sectors within a region of the data area to produce unreadable or subversive data.
53. A method of copy protecting an optical disc according to Claim 33, further comprising including information bits or sectors of information bits whose information content has been rendered incorrect in a region of the data area to provide the unreadable or subversive data.
54. A volume of content for application to a data carrying disc, the content being arranged within one or more content files, and the content being accessible by control data defining navigable paths, wherein the content files have been altered to include at least one region containing unreadable or subversive data, and control data defining the navigable paths has been adjusted such that access to the or each region of unreadable or subversive data will be prevented during normal playback of a disc.
55. A volume of content for application to a data carrying disc according to Claim 54, wherein said region contains both buffering data and subversive data.
56. A volume of content for application to a data carrying disc according to Claim 55, wherein said region contains buffering data followed by subversive data.
57. A volume of content for application to a data carrying disc according to Claim 55, wherein said region contains buffering data following the subversive data.
58. A volume of content for application to a data carrying disc according to Claim 55, wherein said buffering data has non-subversive properties.
59. A volume of content for application to a data carrying disc according to Claim 54, wherein at least one region of a readable or subversive data is formed within an individual content file.
60. A volume of content for application to a data carrying disc according to Claim 54, wherein at least one region of a readable or subversive data is formed between content files.
61. A volume of content for application to a data carrying disc according to Claim 60, wherein at least one region of unreadable or subversive data is formed as a gap between two adjacent content files.
62. A volume of content for application to a data carrying disc according to Claim 54, wherein the content files are video abject files which are composed of video objects (VOBs) which are divided into cells, and wherein the cells can be accessed by respective pointers in a program chain.
63. A volume of content for application to a data carrying disc according to Claim 62, wherein at least one region of unreadable or subversive data is formed as an unstructured region within a video object or between video objects.
64. A volume of content for application to a data carrying disc according to Claim 62, wherein the or each region of unreadable or subversive data is formed as an additional cell within a video object.
65. A volume of content for application to a disc according to Claim 62, wherein at least one region of unreadable or subversive data is formed in an existing cell within a video object.
66. A volume of content for application to a data carrying disc according to Claim 62, wherein at least one region of unreadable or subversive data is farmed in a video object which is interleaved with existing content.
67. A volume of content for application to a data carrying disc according to Claim 62, wherein the program chains do not include pointers accessing at least one region of unreadable or subversive data.
68. A volume of content for application to a data carrying disc according to Claim 62, wherein the program chains do nclude pointers accessing at least one region of unreadable or subversive data but the control data defining the program chains is altered such that the unreadable or subversive data is not accessed during normal playback of the content on the disc.
69. A volume of content for application to a data carrying disc according to Claim 54, wherein the unreadable or subversive data includes or comprises data patterns chosen to cause DSV problems.
70. A volume of content for application to a data carrying disc according to Claim 69, wherein said data patterns have been chosen to ensure that the DSV
has a significant absolute value.
71. A volume of content for application to a data carrying disc according to Claim 69, wherein said data patterns have been chosen to produce a DSV
which has a rapid rate of change.
72. A volume of content for application to a data carrying disc according to Claim 54, wherein the unreadable or subversive data has incorrect control data associated therewith.
73. A volume of content for application to a data carrying disc according to Claim 72, wherein the incorrect control data associated with the unreadable or subversive data comprises incorrect error correcting codes.
74. A volume of content for application to a data carrying disc according to Claim 54, wherein the unreadable or subversive data includes or has mistimed waveform transitions.
75. A volume of content for application to a data carrying disc according to Claim 54, wherein the unreadable or subversive data includes or comprises information bits or sectors of information b ts whose information content has been rendered incorrect.
CA2496137A 2004-02-19 2005-02-08 Improvements in or relating to the copy protection of optical discs Expired - Fee Related CA2496137C (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US54597904P 2004-02-19 2004-02-19
US60/545,979 2004-02-19
US10/939,186 2004-09-10
US10/939,186 US8059937B2 (en) 2004-02-19 2004-09-10 Relating to the copy protection of optical discs

Publications (2)

Publication Number Publication Date
CA2496137A1 true CA2496137A1 (en) 2005-08-19
CA2496137C CA2496137C (en) 2012-01-03

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CA2496137A Expired - Fee Related CA2496137C (en) 2004-02-19 2005-02-08 Improvements in or relating to the copy protection of optical discs

Country Status (8)

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US (2) US8059937B2 (en)
EP (1) EP1566803A3 (en)
JP (1) JP2005251379A (en)
KR (1) KR100687383B1 (en)
AU (1) AU2005200509B2 (en)
CA (1) CA2496137C (en)
GB (1) GB2411282B (en)
NZ (1) NZ538108A (en)

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US8254761B2 (en) 2007-03-07 2012-08-28 Rovi Solutions Corporation Copying digital content by emulating playing of a recording medium by a player

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EP1566803A2 (en) 2005-08-24
AU2005200509A1 (en) 2005-09-08
KR20060043001A (en) 2006-05-15
US20120033946A1 (en) 2012-02-09
GB2411282A (en) 2005-08-24
US20050185926A1 (en) 2005-08-25
EP1566803A3 (en) 2006-08-23
GB2411282B (en) 2007-05-30
JP2005251379A (en) 2005-09-15
US8059937B2 (en) 2011-11-15
KR100687383B1 (en) 2007-02-27
AU2005200509B8 (en) 2005-09-08
NZ538108A (en) 2006-09-29
AU2005200509B2 (en) 2007-06-14
CA2496137C (en) 2012-01-03
GB0502253D0 (en) 2005-03-09

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