Multi-factor content protection

Details Multi-factor content protection Multi-factor content protection

2007-10-11

2011-11-15

Moazzami, Nasser (Department: 2436)

Cryptography

Key management

Key distribution

C705S071000, C726S001000

Reexamination Certificate

active

08059820

ABSTRACT:
Protecting content. A recipient receives content from a publisher. Some content is managed by an access server. The access server controls the recipient's use of managed content through interaction with a trusted agent at the recipient. The content is encrypted to a content key, and the content is associated with policy information. The policy information includes the content key for decrypting the content. The policy information is encrypted to an access server key allowing the policy information to be decrypted by the access server. The content key is received from the access server. The content key is encrypted to a trusted agent key. The content key is further encrypted to additional factor(s) defining additional content protection beyond that provided by trusted agent. The content key is decrypted using the trusted agent key and the at least one additional factor. The content is decrypted using the content key.

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