Content processing system and content protecting method

• US 20010021255A1
• Filed: 03/12/2001
• Published: 09/13/2001
• Est. Priority Date: 03/13/2000
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ishibashi, Yasuhiro
• Granted Patent: US 6,993,135 B2
• Time in Patent Office: Days
• US Class Current: 380/277
• 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 20/00362 the key being obtained from a media key block [MKB]
• CPC Class Codes: G11B 2020/10833 Copying or moving data from one record carrier to another
• CPC Class Codes: G11B 2220/17 Card-like record carriers
• CPC Class Codes: G11B 2220/2575 DVD-RAMs

Abstract

A content processing system for use in an electronic apparatus includes a unit for acquiring first revocation list information corresponding to a first media type, and a unit for recording the first revocation list information on a recording medium of a second media type. The recorded first revocation list information is used in authentication between the electronic apparatus and the recording medium of the second media type.

Claims

1. A content processing system for use in an electronic apparatus, comprising:

means for acquiring first revocation list information corresponding to a first media type; and

means for recording the first revocation list information on a recording medium of a second media type, the recorded first revocation list information being used in authentication between said electronic apparatus and said recording medium of the second media type.

2. The system according to

claim 1

, wherein said recording means records the first revocation list information by encrypting the first revocation list information by using a media-unique key unique to said recording medium of the second media type.

3. The system according to

claim 2

, wherein the media-unique key is generated on the basis of second revocation list information recorded on said recording medium of the second media type.

4. The system according to

claim 1

, further comprising:

means for performing authentication between said electronic apparatus and said recording medium of the second media type by using a device key of said electronic apparatus and second revocation list information recorded on said recording medium of the second media type;

means for generating a media-unique key unique to said recording medium of the second media type on the basis of the result of the authentication; and

means for encrypting the acquired first revocation list information by using the generated media-unique key,

wherein said recording means records the encrypted first revocation list information on said recording medium of the second media type.

5. The system according to

claim 4

, further comprising:

means for performing authentication between said electronic apparatus and said recording medium of the second media type by using the device key and the recorded first revocation list information, when a content is to be written on said recording medium of the second media type.

6. The system according to

claim 4

, further comprising:

means for performing authentication between said electronic apparatus and said recording medium of the second media type by using the device key and the recorded first revocation list information, when a content is to be reproduced from said recording medium of the second media type.

7. A content protecting method comprising the steps of:

loading first revocation list information corresponding to a first media type into an electronic apparatus;

recording the loaded first revocation list information on a recording medium of a second media type; and

using the recorded first revocation list information in authentication between said electronic apparatus and said recording medium of the second media type.

8. The method according to

claim 7

, wherein the recording step comprises recording the first revocation list information by encrypting the first revocation list information by using a media-unique key unique to said recording medium of the second media type.

9. The method according to

claim 8

, wherein the media-unique key is generated on the basis of second revocation list information recorded on said recording medium of the second media type.

10. The method according to

claim 7

, further comprising the steps of:

performing authentication between said electronic apparatus and said recording medium of the second media type by using a device key of said electronic apparatus and second revocation list information recorded on said recording medium of the second media type;

generating a media-unique key unique to said recording medium of the second media type on the basis of the result of the authentication; and

encrypting the acquired first revocation list information by using the generated media-unique key, wherein the recording step comprises recording the encrypted first revocation list information on said recording medium of the second media type.

11. The method according to

claim 10

, further comprising the step of:

performing authentication between said electronic apparatus and said recording medium of the second media type by using the device key and the recorded first revocation list information, when a content is to be written on said recording medium of the second media type.

12. The method according to

claim 10

, further comprising the step of:

performing authentication between said electronic apparatus and said recording medium of the second media type by using the device key and the recorded first revocation list information, when a content is to be reproduced from said recording medium of the second media type.