DOMAIN UPGRADE METHOD IN DIGITAL RIGHTS MANAGEMENT

• US 20090125718A1
• Filed: 11/07/2008
• Published: 05/14/2009
• Est. Priority Date: 11/08/2007
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHU, Youn-Sung
• Granted Patent: US 8,205,082 B2
• Time in Patent Office: Days
• US Class Current: 713/168
• CPC Class Codes: G06F 21/1012 to domains
• CPC Class Codes: H04L 2209/603 Digital right managament [DRM]
• 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 63/06 for supporting key management in a packet data network cryptographic mechanisms or cryptographic arrangements for key management H04L9/08
• CPC Class Codes: H04L 63/10 for controlling access to devices or network resources
• CPC Class Codes: H04L 9/0891 Revocation or update of secret information, e.g. encryption key update or rekeying

Abstract

Disclosed is domain upgrade method in Digital Rights Management (DRM) capable of reducing network resources by simplifying signal procedures at the time of transferring changed domain keys. A device joining after domain upgrade is provided with only a domain key of a domain generation after the domain upgrade, but is not provided with a domain key of the previous domain generation. Accordingly, even if the joining device is mal-operated or is hacked, contents before upgrade are prevented from being illegally used or leaking out.

Claims

1. A domain upgrade method for a terminal, comprising:

receiving, from a server, a join domain response message including a domain ID field and a domain key;

comparing a domain baseID of a domain ID field included in the join domain response message with a domain baseID of a domain ID stored in the terminal;

comparing a domain generation of the domain ID field included in the join domain response message with a domain generation of the domain ID stored in the terminal, if the domain baseID of the domain ID field included in the join domain response is consistent with the domain baseID stored in the terminal; and

changing a pre-stored domain key into the received domain key if the domain generation of the domain ID field included in the join domain response message is greater than the domain generation stored in the terminal.

2. The method of claim 1, wherein the join domain response message is a ‘

dmpJoinDomainResponse’

message.

3. The method of claim 1, wherein the domain ID field corresponds to a ‘

domID field’

in the join domain response message.

4. The method of claim 1, wherein

the domain baseID indicates an ID of the domain;

and

the domain generation indicates generation of the domain.

5. The method of claim 1, wherein the server is a Right Issuer, or a Domain Authority/Domain Enforcement Agent (DA/DEA).

6. The method of claim 1, wherein the domain key is a master domain key.

7. A domain upgrade method for a terminal, comprising:

receiving, from a terminal, a join domain request message;

sending, to the terminal, a join domain response message including a domain ID field and a domain key in response to reception of the join domain request message;

sending, to the terminal, a join domain response message including changed domain key and domain ID field if the domain is required to change.

8. The method of claim 7, wherein the join domain request message is a ‘

dmpJoinDomainRequest’

message, and the join domain response message is a ‘

dmpJoinDomainResponse’

message.

9. The method of claim 7, wherein the domain ID field corresponds to a ‘

domID’

field in the join domain response message.

10. The method of claim 7, wherein the domain ID field comprises:

a ‘

domain baseID’

indicating an ID of the domain; and

a ‘

domain generation’

indicating generation of the domain.

11. The method of claim 7, wherein the domain key is a master domain key.