Electrical computers and digital processing systems: support – Data processing protection using cryptography – By stored data protection
Reexamination Certificate
2002-06-28
2009-06-16
Moazzami, Nasser G (Department: 2436)
Electrical computers and digital processing systems: support
Data processing protection using cryptography
By stored data protection
C713S180000, C713S183000, C380S201000
Reexamination Certificate
active
07549060
ABSTRACT:
Content is encrypted according to a content key (CK) ((CK(content))), (CK) is protected according to a license server public key (PU-DRM), and rights data associated with the content is retrieved from a rights template and protected according to (PU-DRM). The protected items and a digital signature from the rights template are submitted as a rights label to the license server for signing. The license server verifies the rights template signature, and if such signature verifies signs the rights label to result in a signed rights label (SRL), and returns same. The SRL is concatenated with (CK(content)) and both are distributed to a user. To render the content, the user submits the SRL to the license server to request a license.
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Bourne Steven
Krishnaswamy Vinay
Venkatesh Chandramouli
Microsoft Corporation
Moazzami Nasser G
Shiferaw Eleni A
Woodcock & Washburn LLP
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