Content revocation and license modification in a digital rights management (DRM) system on a computing device
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United States of America Patent
Stats
-
Dec 4, 2007
Grant Date -
May 4, 2006
app pub date -
Nov 3, 2005
filing date -
Mar 26, 2002
priority date (Note) -
In Force
status (Latency Note)
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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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