Method and apparatus for multicast delivery of program...

Details Method and apparatus for multicast delivery of program... Method and apparatus for multicast delivery of program...

2011-01-04

2011-01-04

Zand, Kambiz (Department: 2434)

Electrical computers and digital processing systems: support

Multiple computer communication using cryptography

Having particular address related cryptography

C370S390000

Reexamination Certificate

active

07865723

ABSTRACT:
Method and apparatus providing program information to client devices for at least one multicast stream of digital content is described. In one embodiment, session description messages for the at least one multicast stream of digital content are generated. Each of the session description messages includes at least one content access parameter. The at least one content access parameter may include digital rights management (DRM) data, channel key identification data associated with the at least one channel of the at least one multicast stream of digital content, and/or data indicative of whether each session description message is associated with a channel, a program, or a program segment. Each of the session description messages is signed using a cryptographic key. The session description messages are then multicasted to the client devices using a predefined multicast address.

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K. Umschaden et al. “End-to-end Security for Firewall/NAT Traversal within the Session Initiation Protocol (SIP)” Internet Engineering Task Force (Internet Draft); May 2003.
Handley, Jacobson: RFC 2327—SDP Session Description Protocol, Apr. 1998.
Handley, et al: RFC 2974—Session Announcement Protocol, Oct. 2000.

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