Data processing: financial – business practice – management – or co – Business processing using cryptography – Usage protection of distributed data files
Reexamination Certificate
2006-07-18
2006-07-18
Trammell, James P. (Department: 3621)
Data processing: financial, business practice, management, or co
Business processing using cryptography
Usage protection of distributed data files
C705S051000, C705S050000, C705S057000, C705S058000, C713S193000, C713S165000, C380S231000, C380S232000, C380S233000, C380S234000
Reexamination Certificate
active
07080043
ABSTRACT:
Content revocation is achieved by disabling licenses issued to a computing device for the content. A content revocation is delivered within a license to the computing device. Upon license storage the content revocation is recognized, validated, and stored in a secure state store under the public key of the content server (PU-CS) that issued the content. Each license has a (PU-CS) therein, and each license evaluation considers each content revocation stored in the state store and having the same (PU-CS). The license is disabled or otherwise affected based on the considered content revocation. A content revocation is one form of a license modification that may be delivered within a license.
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Chase, Jr. Charlie David
Gajjala Vijay K.
Ganesan Krishnamurthy
Lafornara Philip J.
McKune Jeffrey Richard
Microsoft Corporation
Trammell James P.
Woodcock & Washburn LLP
Worjloh Jalatee
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