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AssigneesSony Corporation, Sony Electronics Inc.
InventorsBrant L. Candelore, Robert Allan Unger, Leo M. Pedlow, Jr., Gregory Mirsky, Mark Kenneth Eyer
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An encryption arrangement for multiple encryption of television programs. A system according to embodiments of the present invention multiple encrypts only a portion of the data required for full presentation of a television program to permit coexistence of multiple conditional access encryption systems associated with multiple manufacturer's set-top boxes within a single system. In one embodiment, only audio data are encrypted leaving video in the clear. By only encrypting a portion of the program, dramatically less bandwidth is consumed than the alternative of multiple encryption of all program data, thus permitting a larger number of programs to be carried over the same bandwidth while permitting coexistence of multiple conditional access systems in a single cable television system.
A method of encrypting a digital television signal, comprising:
A method of multiple encrypting a digital television signal, comprising:
A digital television receiver device, comprising:
A cable system headend, comprising:
A method of decoding a multiple partially encrypted television signal, comprising:
A method of decoding a partially encrypted television signal, comprising:
A method of encrypting a television signal, comprising:
A method of multiple encrypting a television signal, comprising:
Dependencies are inferred from the claim text.