Title:
A PARTIAL DUAL-ENCRYPTED STREAM UTILIZING PROGRAM MAP TABLES
Document Type and Number:
WIPO Patent Application WO2005004457
Kind Code:
A3
Abstract:
The present invention is suitable for use in a partial dual encrypted system. The present invention allows for two different decryption devices (e.g., an incumbent, or first, set-top and an overlay, or second, set-top) to be located in a single system having an incumbent encryption scheme and a second encryption scheme. Each set-top is designed to decrypt the first or second proprietary encryption schemes, respectively. In accordance with the present invention, the second set-top utilizes a novel program map table to ensure that the second set-top chooses correct elemenentary streams in the partial dual-encrypted stream (i.e., a combined stream including a first encrypted stream, a second encrypted stream, and a clear stream) for a desired program.
Inventors:
PINDER HOWARD G (US)
EVANS JONATHAN BRADFORD (US)
WASILEWSKI ANTHONY J (US)
WOODWARD WILLIAM D JR (US)
EVANS JONATHAN BRADFORD (US)
WASILEWSKI ANTHONY J (US)
WOODWARD WILLIAM D JR (US)
Application Number:
PCT/US2004/019322
Publication Date:
April 14, 2005
Filing Date:
June 18, 2004
Export Citation:
Assignee:
SCIENTIFIC ATLANTA (US)
PINDER HOWARD G (US)
EVANS JONATHAN BRADFORD (US)
WASILEWSKI ANTHONY J (US)
WOODWARD WILLIAM D JR (US)
PINDER HOWARD G (US)
EVANS JONATHAN BRADFORD (US)
WASILEWSKI ANTHONY J (US)
WOODWARD WILLIAM D JR (US)
International Classes:
H04L29/06; H04N5/44; H04N7/16; H04N7/167; H04N7/173; H04N7/24; H04Q11/04; (IPC1-7): H04N7/167
Foreign References:
| US20030026423A1 | 2003-02-06 |
Other References:
See also references of EP 1642459A4
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