Information security – Access control or authentication – Authorization
Reexamination Certificate
2006-06-20
2006-06-20
Smithers, Matthew (Department: 2137)
Information security
Access control or authentication
Authorization
C705S059000
Reexamination Certificate
active
07065787
ABSTRACT:
A packager packages digital content for a user and a licensor issues a digital license to the user for the content such that the user renders the content only in accordance with the license. The licensor and packager share a Secret to allow the packager and the licensor to calculate a content key (KD) for the content. To package the content for the user, the packager calculates a content key (KD) based on the shared Secret and a content ID and encrypts the content according to (KD). To issue a license to the user for the content, the licensor also calculates (KD) based on the shared Secret and the content ID, encrypts (KD) according to a public key of the user to form the license, and sends the license to the user.
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Dublish Pratul
Ganesan Krishnamurthy
Sahasrabudhe Sandeep
Strom Clifford Paul
Microsoft Corporation
Smithers Matthew
Woodcock & Washburn LLP
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