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Partial encryption and PID mapping Number:7,151,831 from the United States Patent and Trademark Office (PTO) owispatent

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Title: Partial encryption and PID mapping

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. PID mapping techniques are used to distinguish between multiple encryptions. 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.

Patent Number: 7,151,831 Issued on 12/19/2006 to Candelore,   et al.

Inventors: Candelore; Brant L. (Escondido, CA), Unger; Robert Allan (El Cajon, CA), Pedlow, Jr.; Leo M. (Ramona, CA)
Assignee: Sony Corporation (Tokyo, JP)
Sony Electronics Inc. (Park Ridge, NJ)
Appl. No.: 10/037,499
Filed: January 2, 2002

Current U.S. Class: 380/200 ; 380/201; 380/210; 380/217
Current International Class: H04N 7/167 (20060101)
Field of Search: 380/200-203,217-218,241 713/160-163,189 705/57-59 725/25,30,31,87

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