Method and system for authorizing client devices to receive...

Details Method and system for authorizing client devices to receive... Method and system for authorizing client devices to receive...

2011-08-16

2011-08-16

Zand, Kambiz (Department: 2434)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Central trusted authority provides computer authentication

C726S010000

Reexamination Certificate

active

08001371

ABSTRACT:
A method and system for authorizing client devices to receive secured data streams through the use of digital certificates embedded in the client devices. A freely distributed cryptographically signed group file with an embedded expiration date is associated with each individual digital certificate. A single group file can be associated with more than one digital certificate but each digital certificate is associated with a single group file. The group file contains cryptographic keys that can be used to decrypt a section of the digital certificate revealing a set of client keys. The client keys are then used to encrypt a program key which are then sent back to the client device. When the client device requests a specific data stream or digital content, an issuance timestamp associated with the content is compared to the expiration date in the group file. If the issuance timestamp is after the expiration date, the client device is declined. If the issuance timestamp is before the expiration date, the requested content, encrypted utilizing the program key, is sent to the client device.

REFERENCES:
patent: 6260142 (2001-07-01), Thakkar et al.
patent: 6801998 (2004-10-01), Hanna et al.
patent: 6950809 (2005-09-01), Dahan et al.
patent: 7590840 (2009-09-01), Langer
patent: 2003/0191953 (2003-10-01), Pandit et al.

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