Cryptography – Video cryptography
Reexamination Certificate
2006-11-21
2006-11-21
Song, Hosuk (Department: 2135)
Cryptography
Video cryptography
C380S201000, C380S210000, C380S217000
Reexamination Certificate
active
07139398
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, a time slicing technique is used to encrypt portions of a program on a time allocated basis. 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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Candelore Brant L.
Derovanessian Henry
Unger Robert Allan
Miller Jerry A.
Miller Patent Services
Song Hosuk
Sony Corporation
Sony Electronics Inc.
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