Title:
コンテンツ保護システムにおけるチェーン化された複数のデジタルライセンスに従ったデジタルコンテンツのレンダリング
Document Type and Number:
Japanese Patent JP4741278
Kind Code:
B2
Abstract:
A request to render encrypted content is received and a chain of licenses corresponding to the content is located. The chain includes a leaf license linked to the content at one end of the chain, a root license at the other end of the chain, and any intermediate licenses therebetween. The leaf license and any intermediate licenses in the chain are each bound to the adjoining license in the chain toward the root license, and the root license is bound to an owner of a private key (PR-U). For each license in the chain, the license is verified and it is confirmed that the license allows the content to be rendered. A decryption key is obtained from the leaf license based on application of (PR-U) to the root license, the obtained key is applied to decrypt the encrypted content, and the decrypted content is rendered.
Inventors:
Brian P. Evans
Clifford P. Strom
Michael Jay Parks
Clifford P. Strom
Michael Jay Parks
Application Number:
JP2005124814A
Publication Date:
August 03, 2011
Filing Date:
April 22, 2005
Export Citation:
Assignee:
MICROSOFT CORPORATION
International Classes:
G06F21/24; G06F1/00; G06F12/14; G06F21/00; H04L9/00; H04L9/08; H04L9/14; H04L9/32; H04L29/06
Domestic Patent References:
| JP2003309545A | ||||
| JP2004056794A | ||||
| JP2004102789A | ||||
| JP11187013A | ||||
| JP2003101526A |
Foreign References:
| WO2002080442A1 |
Attorney, Agent or Firm:
Yoshikazu Tani
Kazuo Abe
Kazuo Abe