Method of recording and/odr reproducing data under control of domain management system

• US 20050169118A1
• Filed: 02/02/2005
• Published: 08/04/2005
• Est. Priority Date: 02/02/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Yun-Sang, You, Yong-kuk, Han, Sung-hyu, Han, Hee-chul, Choi, Yang-Iim
• Granted Patent: US 7,802,312 B2
• Time in Patent Office: Days
• US Class Current: 369/30.50
• 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 20/00492 wherein content or user data is encrypted
• CPC Class Codes: G11B 20/00753 wherein the usage restriction limits the number of copies that can be made, e.g. CGMS, SCMS, or CCI flags
• CPC Class Codes: G11B 20/10 Digital recording or reproducing
• CPC Class Codes: H04L 2463/101 applying security measures for digital rights management data processing systems or methods, specially adapted for commerce, e.g. marketing, shopping, billing, auctions or e-commerce G06Q30/00
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload
• CPC Class Codes: H04L 63/0823 using certificates cryptographic mechanisms or cryptographic arrangements for entity authentication involving certificates H04L9/3263
• CPC Class Codes: H04N 21/4334 Recording operations recording of a television signal H04N5/76; arrangements for recording or accumulating broadcast information or broadcast-related information H04H60/27
• CPC Class Codes: H04N 21/43615 Interfacing a Home Network, e.g. for connecting the client to a plurality of peripherals home Audio Video Interoperability [HAVI] data switching networks H04L12/2805
• CPC Class Codes: H04N 21/4408 involving video stream encryption, e.g. re-encrypting a decrypted video stream for redistribution in a home network
• CPC Class Codes: H04N 21/4627 Rights management associated to the content security in data switching network management H04L41/28; security management or policies for network security H04L63/20; access security in wireless networks H04W12/08

Abstract

Provided are a method of recording/reproducing data under control of a domain management system. The method includes extracting, from the write command, domain management information regarding the predetermined domain and contents, and copy control information specifying an extent of copying the contents within the predetermined domain; recording the extracted domain management information on the storage medium; generating a domain-bound flag that is used to determine whether the recording apparatus which records the contents on a storage medium is present in the predetermined domain, based on the extracted copy control information; and recording the domain-bound flag and the contents on the storage medium. Accordingly, it is possible to record contents, recording of which is limited within a predetermined domain, on a storage medium outside a slave under control of a domain management system, while preventing the contents from being reproduced within other domains.

Claims

1. A method of recording contents on a storage medium in response to a write command input from a domain management system that causes the contents to be used only within a predetermined domain, the method comprising:

extracting, from the write command, domain management information regarding the predetermined domain and the contents, and copy control information specifying an extent of copying the contents within the predetermined domain;

recording the extracted domain management information on the storage medium;

generating a domain-bound flag that is used to determine whether the recording apparatus which records the contents on the storage medium is present in the predetermined domain, based on the extracted copy control information; and

recording the domain-bound flag and the contents on the storage medium.

2. The method of claim 1, wherein the copy control information specifies that the contents is domain-bound contents that is required to be recorded using only the recording apparatus that is present within the domain.

3. The method of claim 2, wherein the copy control information classifies an extent of copying the contents by a copying state including at least one of copy never, copy freely, private copy, copy once, domain-bound copy.

4. The method of claim 1, wherein the domain management information comprises a domain identifier which identifies the domain.

5. The method of claim 2, wherein the domain management information further comprises a content key for encrypting the contents and system information for identifying the domain management system.

6. The method of claim 5, wherein the content key is encrypted using a domain key that is available only to a user authorized to access to the domain.

7. The method of claim 6, wherein the system information comprises one of an identifier that identifies the domain management system and domain management system version information, or both the identifier and the domain management system version information.

8. The method of claim 1, wherein recording the domain management information comprises encrypting the domain management information.

9. The method of claim 6, wherein encrypting of the content key uses an encrypting key generated, using drive information regarding the recording apparatus that records the contents and disc information regarding the storage medium.

10. The method of claim 1, further comprising authenticating the domain management system.

11. The method of claim 10, wherein the domain management system is authenticated using a predetermined certified revocation list.

12. The method of claim 11, wherein authenticating the domain management system comprises:

receiving a certificate certifying that a software identifier and a software public key of the domain management system are authenticated using a private key of a third authentication agency;

verifying the certificate using a public key of the third authentication agency; and

determining whether the software identifier is listed in the certified revocation list.

13. A method of reproducing contents from a storage medium under control of a domain management system that causes the contents to be used within a predetermined domain, the method comprising:

receiving a read command from the domain management system;

reading a domain-bound flag that is used to determine whether reproduction of the contents is limited within the predetermined domain;

when the domain-bound flag indicates reproduction of the contents only within the predetermined domain, receiving current domain management information regarding a current domain from the domain management system, and receiving recording domain management information regarding a recording domain in which recording of the contents is performed from the storage medium;

determining whether the domain management system belongs to the predetermined domain based on the recording domain management information and the current domain management information; and

transmitting the recording domain management information and the contents to the domain management system.

14. The method of claim 13, wherein when the domain-bound flag indicates reproduction of the contents is not limited only within the predetermined domain, the contents is read from the storage medium and transmitted to the domain management system.

15. The method of claim 13, wherein the current domain management information comprises a domain identifier that identifies the current domain, and the recording domain management information comprises a domain identifier enabling identification of the recording domain.

16. The method of claim 15, wherein both the current domain management information and the recording domain management information comprise a content key for encrypting the contents and system information enabling identification of the domain management information.

17. The method of claim 16, wherein the content key is encrypted using a domain key that is available only to a user authorized to access to the predetermined domain.

18. The method of claim 16, wherein the system information comprises one of a system identifier for identifying the domain management system and domain management system version information, or both the system identifier enabling and domain management system version information.

19. The method of claim 18, wherein determining whether the domain management system belongs to the predetermined domain comprises determining whether the current domain management system is equivalent to the recording domain management system based on the system information.

20. The method of claim 18, wherein determining whether the domain management system belongs to the predetermined domain further comprises determining whether the current domain management system is equivalent to the recording domain management system based on the domain identifier.