发明名称 |
ELEMENTARY STREAM PARTIAL ENCRYPTION |
摘要 |
An encryption arrangement for multiple encryption of television program s. 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 wit h 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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申请公布号 |
CA2405865(A1) |
申请公布日期 |
2003.04.26 |
申请号 |
CA20022405865 |
申请日期 |
2002.10.01 |
申请人 |
SONY ELECTRONICS INC. |
发明人 |
MIRSKY, GREGORY;PEDLOW, LEO M., JR.;UNGER, ROBERT ALLAN;CANDELORE, BRANT L.;EYER, MARK KENNETH |
分类号 |
H04N7/10;H04N7/16;H04N7/20;(IPC1-7):H04N7/16 |
主分类号 |
H04N7/10 |
代理机构 |
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