Cryptography – Video cryptography
Reexamination Certificate
2005-05-24
2005-05-24
Morse, Gregory (Department: 2134)
Cryptography
Video cryptography
C380S201000, C380S210000, C380S211000, C713S152000, C713S152000, C709S231000
Reexamination Certificate
active
06898285
ABSTRACT:
A system for streaming encrypted conditional access (CA) data, such as control words, from a primary or master conditional access provider (CAP) to one or more secondary CAPS. The primary CAP encrypts content (program data) that is to be access-controlled, such as a television program, according to the associated CA data. A first group of user terminals is compatible with the CA data of the primary CAP. The CA data is then provided to the secondary CAPs to provide corresponding CA data for the content in the secondary CAPs' associated formats for compatibility with other groups of terminals. The invention can be used in any packet-based distribution system, including a broadband television network headend, and avoids the need for the secondary CAPs to request the control words on an as-needed basis. Moreover, the CA data for a current crypto-period and a number of future crypto-periods are provided in a “sliding window” to allow the secondary CAP to begin preparing its CA data in advance. Moreover, the CA data can be provided to the secondary CAPs on a real-time basis, or well beforehand when the content is pre-encrypted and stored, e.g., at a file server.
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Digital Video Broadcasting (DVB): DVB SimulCrypt; Part 1: Head-end architecture and synchronization, TS 101 197-1, v1.1.1, Jun. 1997.
DePietro Mark
DiColli Richard
Hutchings George T.
Sprunk Eric
Vince Lawrence D.
General Instrument Corporation
Lipsitz Barry R.
McAllister Douglas M.
Morse Gregory
Tran Tongoc
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