Title:
SYSTEM AND METHOD FOR HYBRID CONDITIONAL ACCESS FOR RECEIVERS OF ENCRYPTED TRANSMISSIONS
Document Type and Number:
WIPO Patent Application WO2003017666
Kind Code:
A3
Abstract:
A system for decrypting transmissions encrypted by a transmission station includes a receiver having a first conditional access module embedded within the receiver, and a second conditional access module that is removable from the receiver. The first conditional access module decrypts a first signal transmitted by the transmission station and the second conditional access module decrypts a second signal transmitted by the transmission station. The first and second signals are encrypted by separate conditional access modules. The transmission station provides the receiver with an entitlement code for allowing the receiver to decrypt the transmission upon verification by the transmission station that the receiver is entitled to decrypt the transmission.
Inventors:
FREEMAN MARTIN
LU JIN
LU JIN
Application Number:
PCT/IB2002/003206
Publication Date:
June 03, 2004
Filing Date:
July 31, 2002
Export Citation:
Assignee:
KONINKL PHILIPS ELECTRONICS NV (NL)
International Classes:
H04L9/10; H04L9/14; H04N7/16; H04N21/4405; H04N21/4623; (IPC1-7): H04N7/16; H04N7/167
Foreign References:
| EP0506435A2 | 1992-09-30 | |||
| EP0752635A1 | 1997-01-08 | |||
| EP0585833A1 | 1994-03-09 | |||
| EP0570785A1 | 1993-11-24 | |||
| US5029207A | 1991-07-02 |
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