METHOD FOR JOINING USER DOMAIN AND METHOD FOR EXCHANGING INFORMATION IN USER DOMAIN

• US 20090198993A1
• Filed: 12/15/2008
• Published: 08/06/2009
• Est. Priority Date: 01/31/2008
• Status: Active Grant

• Current Assignee: Helios Streaming, LLC (Ideahub, Inc.)
• Original Assignee: Pantech & Curitel Communications Incorporated (Pantech Incorporated)
• Inventors: KIM, Gun-wook
• Granted Patent: US 8,856,510 B2
• Time in Patent Office: Days
• US Class Current: 713/150
• CPC Class Codes: G06F 21/10 Protecting distributed programs or content, e.g. vending or licensing of copyrighted material protection in video systems or pay television H04N7/16 ; Digital rights management [DRM]

Abstract

A method for joining a user domain based on digital right management (DRM), a method for exchanging information between a user device and a domain enforcement agent, and a method for exchanging information between user devices belonging to the same user domain include sharing a domain session key between the user device and the domain enforcement agent or between the user devices belonging to the same user domain. Information is exchanged through a secure session set up between the user device and domain enforcement agent or between the user devices, and information exchange occurs through encryption/decryption using the domain session key.

Claims

1. A method for joining a user domain based on digital rights management (DRM), comprising:

in a user device, transmitting a domain join request message including a first domain session key to a domain enforcement agent managing the user domain; and

receiving a domain join response message from the domain enforcement agent in response to the domain join request message, the domain join response message including a second domain session key.

2. The method of claim 1, wherein the first domain session key is stored in both the user device and the domain enforcement agent.

3. The method of claim 1, wherein the second domain session key has a value corresponding to a value of the first domain session key.

4. The method of claim 3, wherein the second domain session key has a value that is the same as the value of the first domain session key.

5. The method of claim 3, wherein the second domain session key has a value obtained by transforming the value of the first domain session key.

6. The method of claim 3, wherein the second domain session key has a predetermined value set by the domain enforcement agent.

7. The method of claim 3, wherein the second domain session key has a value obtained by using the first domain session key and a predetermined value set by the domain enforcement agent.

8. The method of claim 3, wherein the first domain session key, the second domain session key, or a value obtained by using the first domain session key and the second domain session key is used as a key value of a symmetric key algorithm, or as a seed to induce the key value.

9. The method of claim 1, wherein the domain join request message further includes a device identifier to identify the user device, and a domain identifier to identify the user domain that the user domain wants to join.

10. The method of claim 1, wherein the domain join response message further includes a device identifier to identify the user device, a domain identifier to identify the user domain that the user device wants to join, and status information regarding a determination on whether to allow the user device to join the user domain.

11. A method for exchanging information between a user device and a domain enforcement agent based on digital rights management (DRM), comprising:

encrypting information using a domain session key shared by the user device and the domain enforcement agent, and transmitting the encrypted information; and

receiving the encrypted information and decrypting the encrypted information using the domain session key shared by the user device and the domain enforcement agent.

12. The method of claim 11, wherein the domain session key is exchanged between the user device and the domain enforcement agent when a domain join request message is processed between the user device and the domain enforcement agent.

13. The method of claim 11, wherein the domain session key comprises:

a first domain session key included in a domain join request message transmitted from the user device to the domain enforcement agent, or a second domain session key included in a domain join response message transmitted from the domain enforcement agent to the user device in response to the domain join request message.

14. The method of claim 13, wherein the first domain session key is stored in both the user device and the domain enforcement agent.

15. The method of claim 13, wherein the second domain session key has a value corresponding to a value of the first domain session key.

16. A method for exchanging information between a first user device and a second user device based on digital rights management (DRM), comprising:

in the first user device, designating the second user device with which to exchange information, and requesting a domain enforcement agent to send a new domain session key;

in the domain enforcement agent, generating the new domain session key for information exchange between the first user device and the second user device, and transmitting the new domain session key to the first user device and the second user device; and

in the first user device and the second user device, receiving the new domain session key from the domain enforcement agent, and exchanging information using the new domain session key.

17. The method of claim 16, wherein the new domain session key is used as a key value of a symmetric key algorithm or as a seed for inducing the key value.