CA2487408A1 - Method of managing copy protection information of a recording medium, recording medium with copy protection information for contents recorded thereon, and reproducing method for the recording medium - Google Patents

Method of managing copy protection information of a recording medium, recording medium with copy protection information for contents recorded thereon, and reproducing method for the recording medium Download PDF

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Publication number
CA2487408A1
CA2487408A1 CA002487408A CA2487408A CA2487408A1 CA 2487408 A1 CA2487408 A1 CA 2487408A1 CA 002487408 A CA002487408 A CA 002487408A CA 2487408 A CA2487408 A CA 2487408A CA 2487408 A1 CA2487408 A1 CA 2487408A1
Authority
CA
Canada
Prior art keywords
area
recording medium
copy protection
protection information
set forth
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
CA002487408A
Other languages
French (fr)
Other versions
CA2487408C (en
Inventor
Sang Woon Suh
Jin Yong Kim
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.)
LG Electronics Inc
Original Assignee
Lg Electronics Inc.
Sang Woon Suh
Jin Yong Kim
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
Application filed by Lg Electronics Inc., Sang Woon Suh, Jin Yong Kim filed Critical Lg Electronics Inc.
Publication of CA2487408A1 publication Critical patent/CA2487408A1/en
Application granted granted Critical
Publication of CA2487408C publication Critical patent/CA2487408C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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
    • 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
    • G11B19/00—Driving, starting, stopping record carriers not specifically of filamentary or web form, or of supports therefor; Control thereof; Control of operating function ; Driving both disc and head
    • G11B19/02—Control of operating function, e.g. switching from recording to reproducing
    • G11B19/12—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark
    • G11B19/122—Control of operating function, e.g. switching from recording to reproducing by sensing distinguishing features of or on records, e.g. diameter end mark involving the detection of an identification or authentication mark
    • 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
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • 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
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
    • G11B20/00297—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored in a management area, e.g. the video manager [VMG] of a DVD
    • G11B20/00304—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored in a management area, e.g. the video manager [VMG] of a DVD the key being stored in the lead-in area [LIA]
    • 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
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
    • G11B20/00297—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored in a management area, e.g. the video manager [VMG] of a DVD
    • G11B20/00311—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being stored in a management area, e.g. the video manager [VMG] of a DVD the key being stored in the lead-out area [LOA]
    • 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
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00217—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source
    • G11B20/00253—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier
    • G11B20/00326—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier the cryptographic key used for encryption and/or decryption of contents recorded on or reproduced from the record carrier being read from a specific source wherein the key is stored on the record carrier the key being embossed on the record carrier
    • 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
    • G11B20/0021—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier
    • G11B20/00485—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier
    • G11B20/00492—Circuits for prevention of unauthorised reproduction or copying, e.g. piracy involving encryption or decryption of contents recorded on or reproduced from a record carrier characterised by a specific kind of data which is encrypted and recorded on and/or reproduced from the record carrier wherein content or user data is encrypted
    • 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
    • G11B20/12—Formatting, e.g. arrangement of data block or words on the record carriers
    • G11B2020/1264—Formatting, e.g. arrangement of data block or words on the record carriers wherein the formatting concerns a specific kind of data
    • G11B2020/1288—Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
    • 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
    • G11B2220/2541—Blu-ray discs; Blue laser DVR discs

Abstract

The present invention relates to a method of managing CPI (Copy Protection Information) for preventing unauthorized copy of encrypted content recorded on a high-density recording medium such as a BD-ROM (Blu-ray Disc ROM). In the present method, when main content data is recorded in encrypted manner, CPI
that is necessary to decrypt the encrypted main content data is written in a predetermined PIC area and is also copied at least once in an area other than the PIC area.

Claims (18)

1. A method of recording copy protection information on a recording medium, comprising:
recording encrypted data on the recording medium; and recording copy protection information required for decrypting the encrypted data in a predetermined first area and additionally in a second area other than the first area at least once.
2. The method set forth in claim 1, wherein the first area is a PIC area defined in the recording medium.
3. The method set forth in claim 1, wherein the second area includes an area exclusive of a PIC area within a lead-in area defined in the recording medium.
4. The method set forth in claim 1, wherein the second area includes a lead-out area defined in the recording medium.
5. The method set forth in claim 1, wherein disk information about the recording medium is recorded in the PIC
area defined in the recording medium and the disk information is duplicated also in the area other than the first area.
6. The method set forth in claim 1, wherein disk information about the recording medium is recorded in a PIC
area defined in the recording medium and position information for the copy protection information recorded in the second area is recorded in the disk information.
7. A recording medium, comprising:
a data area storing encrypted data;
a first area storing copy protection information required for decrypting the encrypted data; and at least one second area storing a duplicate of the copy protection information.
8. The recording medium set forth in claim 7, wherein the first area is a PIC area defined in the recording medium.
9. The recording medium set forth in claim 7, wherein the second area includes an area exclusive of a PIC area within a lead-in area defined in the recording medium.
10. The recording medium set forth in claim 7, wherein the second area includes a lead-out area defined in the recording medium.
11. The recording medium set forth in claim 7, wherein the first area stores position information for the copy protection information duplicated in the second area.
12. A method of reproducing a recording medium by a disk reproducing apparatus, comprising the steps of:
(a) driving the recording medium storing encrypted data;
(b) detecting copy protection information, which is required for decrypting the encrypted data, recorded in a first area of the recording medium; and (c) if an error occurs in the detection of the copy protection information, detecting duplicated copy protection information from a second area other than the first area and decrypting the encrypted data using the detected copy protection information.
13. The method set forth in claim 12, wherein the first area is a PIC area defined in the recording medium.
14. The method set forth in claim 12, wherein the second area includes an area exclusive of a PIC area within a lead-in area defined in the recording medium.
15. The method set forth in claim 12, wherein the second area includes a lead-out area defined in the recording medium.
16. The method set forth in claim 12, wherein the step (c) detects position information for the duplicated copy protection information included in disk information for the recording medium and reads the duplicated copy protection information from the position to decrypt the encrypted data.
17. The method set forth in claim 12, wherein the step (c) detects position information for the duplicated copy protection information stored in a predetermined position in the apparatus and reads the duplicated copy protection information from the position to decrypt the encrypted data.
18. The method set forth in claim 12, wherein, if the detection of the duplicated copy protection information fails, the step (c) detects duplicated copy protection information from another area.
CA2487408A 2003-01-24 2004-01-24 Method of managing copy protection information of a recording medium, recording medium with copy protection information for contents recorded thereon, and reproducing method for the recording medium Expired - Fee Related CA2487408C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR10-2003-0004930 2003-01-24
KR1020030004930A KR100952949B1 (en) 2003-01-24 2003-01-24 Method for managing a copy protection information of high density optical disc
PCT/KR2004/000113 WO2004066298A1 (en) 2003-01-24 2004-01-24 Method of managing copy protection information of a recording medium, recording medium with copy protection information for contents recorded thereon, and reproducing method for the recording medium

Publications (2)

Publication Number Publication Date
CA2487408A1 true CA2487408A1 (en) 2004-08-05
CA2487408C CA2487408C (en) 2012-10-23

Family

ID=36121685

Family Applications (1)

Application Number Title Priority Date Filing Date
CA2487408A Expired - Fee Related CA2487408C (en) 2003-01-24 2004-01-24 Method of managing copy protection information of a recording medium, recording medium with copy protection information for contents recorded thereon, and reproducing method for the recording medium

Country Status (13)

Country Link
US (2) US8090103B2 (en)
EP (2) EP1586094B1 (en)
JP (2) JP2006516788A (en)
KR (1) KR100952949B1 (en)
CN (2) CN1698115B (en)
AT (1) ATE494613T1 (en)
AU (1) AU2004206485B2 (en)
BR (1) BRPI0403961A (en)
CA (1) CA2487408C (en)
DE (1) DE602004030917D1 (en)
MX (1) MXPA04012594A (en)
RU (2) RU2328778C2 (en)
WO (1) WO2004066298A1 (en)

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