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

• US 8,009,832 B2
• Filed: 02/21/2006
• Issued: 08/30/2011
• Est. Priority Date: 01/24/2003
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Suh, Sang Woon, Kim, Jin Yong
• Primary Examiner(s): Abrishamkar; Kaveh
• Application Number:
  US11/357,059
• Publication Number:
  US 20060143480A1
• Time in Patent Office: 2,016 Days
• Field of Search: None
• US Class Current: 380/201
• CPC Class Codes: G11B 19/122 involving the detection of an identification or authentication mark record carriers indicating unauthorised or prior use G11B23/28
• CPC Class Codes: G11B 20/00086 Circuits for prevention of unauthorised reproduction or copying, e.g. piracy indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00
• CPC Class Codes: G11B 20/0021 involving encryption or decryption of contents recorded on or reproduced from a record carrier
• CPC Class Codes: G11B 20/00304 the key being stored in the lead-in area [LIA]
• CPC Class Codes: G11B 20/00311 the key being stored in the lead-out area [LOA]
• CPC Class Codes: G11B 20/00326 the key being embossed on the record carrier
• CPC Class Codes: G11B 20/00492 wherein content or user data is encrypted
• CPC Class Codes: G11B 2020/1288 Formatting by padding empty spaces with dummy data, e.g. writing zeroes or random data when de-icing optical discs
• CPC Class Codes: G11B 2220/2541 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

1. A method of recording data on a recording medium, comprising:

generating a control information unit to control a recording or reproducing of data;

recording the control information unit at a specific area in a lead-in area or a lead-out area of the recording medium; and

recording copy-protected data in a main data area of the recording medium,

recording copy protection information, duplicated from original copy protection information pre-recorded in the recording medium, in a first area formed in the lead-in area, the lead-out area or both the lead-in area and the lead-out area, wherein the first area is separated from the main data area, and the copy protection information is required for generating and/or processing the copy protected data,

wherein the control information unit includes an identifier to indicate a position of the copy protection information.

2. The method of claim 1, wherein the step of recording copy protection information records the duplicated copy protection information in a zone other than the specific area within the lead-in area where the control information unit is recorded.

3. The method of claim 1, wherein the copy protection information includes a key value required for generating/processing the copy-protected data.

4. The method of claim 1, wherein the recording medium is an optical disc, the step of generating generates the control information unit including a disc information containing at least disc type information, disc size information, disc structure information, and data zone allocation information.

5. The method of claim 4, wherein the step of generating generates the control information unit copied from original control information unit pre-recorded in the recording medium.

6. A recording medium, comprising:

a control data area for recording a control information unit to control a recording or reproducing of data, the control data area being formed in a lead-in area or a lead-out area defined in the recording medium;

a first area for recording copy protection information duplicated from original copy protection information pre-recorded in the recording medium, the copy protection information being required for generating and/or processing copy-protected data, the first area being formed in the lead-in area, the lead-out area or both the lead-in area and the lead-out area; and

a main data area where data is recorded or to be recorded,

wherein the control information unit includes an identifier to indicate a position of the copy protection information, and the first area is formed in a zone other than the control data area where the control information unit is recorded.

7. The recording medium of claim 6, wherein the main data area includes the copy-protected data generated by the copy protection information.

8. The recording medium of claim 6, wherein the recording medium is an optical disc, the control information unit includes a disc information containing at least disc type information, disc size information, disc structure information, and data zone allocation information.

9. The recording medium of claim 8, wherein the control information unit is information unit copied from original control information unit pre-recorded in the recording medium.

10. The recording medium of claim 6, wherein the copy protection information includes a key value required for generating/processing the copy-protected data.

11. The recording medium of claim 10, wherein the key value is recorded in wobbled form and/or straight pre-pit form.

12. An apparatus for reproducing a recording medium, comprising:

a pickup unit configured to read data from the recording medium; and

a controller configured to control the pickup unit to detect a control information unit to control a reproducing of data and copy protection information required for processing copy-protected data and configured to control a reproducing of the copy protected data based on the control information unit and the copy protection information,

wherein the copy protection information is information duplicated from original copy protection information pre-recorded in the recording medium,

wherein the controller is configured to identify a position of the copy protection information from an identifier included in the control information unit, and control the pickup unit to detect the original copy protection information or the duplicated copy protection information according to the identified position,

wherein the control information unit is formed at a specific area in a lead-in area or a lead-out area of the recording medium, and the controller is configured to control the pickup unit to detect the duplicated copy protection information from a zone formed in the lead-in area, the lead-out area or both the lead-in area and the lead-out area.

13. The apparatus of claim 12, wherein the controller is configured to control the pickup unit to detect the duplicated copy protection information based on the identified position if the detection of the original copy protection information fails.

14. The apparatus of claim 12, wherein the recording medium is an optical disc, and the control information unit includes disc information containing at least disc type information, disc size information, disc structure information, and data zone allocation information.

15. The apparatus of claim 12, wherein the copy protection information includes a key required for processing the copy-protected data, and the controller is configured to control a decryption of the copy-protected data using the key.

16. The apparatus of claim 12, wherein the control information unit is an information unit copied from an original control information unit pre-recorded in the recording medium, and the controller is configured to identify a position of the duplicated copy protection information from the original control information unit or the copied control information unit.