Elementary stream partial encryption

Details Elementary stream partial encryption Elementary stream partial encryption

2006-10-17

2006-10-17

Sheikh, Ayaz (Department: 2136)

Electrical computers and digital processing systems: support

Data processing protection using cryptography

By stored data protection

C713S189000

Reexamination Certificate

active

07124303

ABSTRACT:
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.

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