License Data Structure and License Issuing Method

• US 20080195548A1
• Filed: 04/11/2006
• Published: 08/14/2008
• Est. Priority Date: 04/11/2005
• Status: Abandoned Application

• Current Assignee: Electronics and Telecommunications Research Institute
• Original Assignee: Electronics and Telecommunications Research Institute
• Inventors: Hong, Jin Woo, Choi, Bum Suk, Byun, Young Bae, Ju, Sang Hyun, Nam, Je Ho, Chu, Hyun Gon
• Application Number:
  US11/911,127
• Publication Number:
  US 20080195548A1
• Time in Patent Office: Days
• US Class Current: 705/59
• 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 license data structure and distribution (issuance) method are provided, that can accommodate one domain including multiple content playback devices and/or users. A method for creating license data in the invention includes the steps of: creating raw license data to be issued; firstly encrypting the raw license data with an encryption key of a user and/or device; and encrypting the data encrypted with the user and/or device public key using a public key of a home domain. Also, a license data structure of the invention includes an encrypted license block created by firstly encrypting raw license data containing data for playing content with a distributed encryption key of a user and/or device, and then secondly encrypting this with a distributed encryption key of a home domain; and TAG information necessary for decryption of a second encryption capsule.

Claims

1. A method for creating a license, comprising the steps of:

creating raw license data to be issued;

firstly encrypting the raw license data with at least one of a user encryption key and a device encryption key; and

secondly encrypting the firstly encrypted data with an encryption key of a home domain.

2. The method for creating a license according to claim 1, further comprising the step of creating and appending a TAG including information about the first encryption process.

3. The method for creating a license according to claim 1, further comprising the step of creating and appending a TAG including information about the second encryption process.

4. A license data structure comprising:

an encrypted license block created by firstly encrypting raw license data containing data necessary for playing content with at least one of a user encryption key and a device encryption key, and secondly encrypting the data with a encryption key of a home domain where to be distributed; and

TAG information necessary for decrypting the encrypted license block.

5. The license data structure according to claim 4, wherein the encrypted license block is created by encrypting the firstly encrypted raw license data and TAG necessary for its decryption together.

6. A method for issuing a license, comprising the steps of:

(a) requesting issue of a license necessary for playing content from a home domain device to a clearing house;

(b) verifying the license issue request at the clearing house; and

(c) creating a license encrypted with at least one of an encryption key of the home domain device and an encryption key of a user, and an encryption key of a home domain, and then transmitting the license to the home domain device.

7. The method for issuing a license according to claim 6, wherein step (a) comprises the steps of:

requesting issue of a license from a home domain device to a home domain controller;

searching for the location of a corresponding clearing house at the home domain controller; and

requesting issue of a license from the home domain controller to the clearing house.

8. The method for issuing a license according to claim 7, further comprising the step of verifying, at the home domain controller, the license issue request of the home domain device.

9. The method for issuing a license according to claim 6, wherein in step (c), a license is created by performing a method for creating a license, comprising the steps of:

creating raw license data to be issued;

firstly encrypting the raw license data with at least one of a user encryption key and a device encryption key; and

secondly encrypting the firstly encrypted data with an encryption key of a home domain.

10. The method for issuing a license according to claim 6, wherein in step (c), a license is created by performing a method for creating a license, comprising the steps of:

creating raw license data to be issued;

firstly encrypting the raw license data with at least one of a user encryption key and a device encryption key;

creating and appending a TAG including information about the first encryption process; and

secondly encrypting the firstly encrypted data with an encryption key of a home domain.

15. The method for issuing a license according to claim 6, wherein the license issued in step (c) has a license data structure comprising:

an encrypted license block created by firstly encrypting raw license data containing data necessary for playing content with at least one of a user encryption key and a device encryption key, and secondly encrypting the data with a encryption key of a home domain where to be distributed; and

TAG information necessary for decrypting the encrypted license block.

11. A method for issuing a license at a home domain controller, comprising the steps of:

(a) receiving a license issue request from a home domain device;

(b) verifying the license issue request of the home domain device;

(c) searching for the location of a corresponding clearing house;

(d) requesting issue of a license from the clearing house; and

(e) transmitting the license issued from the clearing house to the home domain device.

12. The method for issuing a license at a home domain controller according to claim 11, after step (b), further comprising the steps of:

(i) checking whether the requested license can be issued by a home domain controller; and

(ii) issuing the requested license by the home domain controller when allowed, and transmitting the license to the home domain device.

13. The method for issuing a license at a home domain controller according to claim 12, wherein in step (ii), the issued license is encrypted with at least one of a user encryption key and a device encryption key.

16. The method for issuing a license according to claim 12, wherein the encrypted license block is created by encrypting the firstly encrypted raw license data and TAG necessary for its decryption together.

14. A method for issuing a license at a home domain controller, comprising the steps of:

creating raw license data to be issued;

firstly encrypting the raw license data with at least one of a user encryption key and a device encryption key;

secondly encrypting the firstly encrypted data with an encryption key of a home domain; and

creating and appending a TAG including information about the second encryption process.