发明名称 |
CRITICAL PACKET PARTIAL ENCRYPTION |
摘要 |
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 critical packets such as those carrying a payload incorporating packetized elementary stream header information is encrypted. 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 |
CA2405901(C) |
申请公布日期 |
2010.03.30 |
申请号 |
CA20022405901 |
申请日期 |
2002.10.01 |
申请人 |
SONY ELECTRONICS INC. |
发明人 |
CANDELORE, BRANT L.;UNGER, ROBERT ALLAN |
分类号 |
H04N7/16;H04L9/00;H04N7/167;H04N7/20 |
主分类号 |
H04N7/16 |
代理机构 |
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