Producing a new black box for a digital rights management...

Cryptography – Key management

Reexamination Certificate

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Details

C380S044000, C380S046000, C713S176000

Reexamination Certificate

active

07319759

ABSTRACT:
A new ((n)th) black box is produced for a digital rights management (DRM) system. The (n)th black box is for being installed in and for performing decryption and encryption functions in the DRM system. The (n)th black box is produced and delivered to the DRM system upon request and includes a new ((n)th) executable and a new ((n)th) key file. The (n)th key file has a new ((n)th) set of black box keys and a number of old sets of black box keys. The request includes an old ((n−1)th) key file having the old sets of black box keys. A code optimizer/randomizer receives a master executable and randomized optimization parameters as inputs and produces the (n)th executable as an output. A key manager receives the (n−1)th key file and the (n)th set of black box keys as inputs, extracts the old sets of black box keys from the (n−1)th key file, and produces the (n)th key file including the (n)th set of black box keys and the old sets of black box keys as an output. The (n)th executable and the (n)th key file are forwarded to the requesting DRM system.

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