| 摘要 |
PROBLEM TO BE SOLVED: To provide an encryption arrangement for multiple encryption of television programs (100). SOLUTION: A system multiple encrypts only a portion of data (118, 124) required for full presentation of a television program to permit coexistence of multiple manufacturer's set-top boxes within a single system. By only encrypting a portion of the program (118, 124), dramatically less bandwidth is consumed than the alternative of multiple encryption of all program data, thus permitting a larger number of conditional access systems (36, 136) to be simultaneously used in a single cable television system. COPYRIGHT: (C)2010,JPO&INPIT |
