Conditional access system enabling partial viewing

Details Conditional access system enabling partial viewing Conditional access system enabling partial viewing

2005-07-19

2005-07-19

Moise, Emmanuel L. (Department: 2131)

Cryptography

Video cryptography

Video electric signal modification

C380S210000, C380S241000, C725S031000

Reexamination Certificate

active

06920222

ABSTRACT:
A conditional access system includes an EMM (Entitlement Management Message) analyzer for retrieving partial viewing authorization information. When the partial viewing authorization information permits partial viewing, ECM (Entitlement Control Message) is decrypted using work keys, and scrambling keys are intermittently retrieved from the ECM. This can solve a problem of a conventional conditional access system in that an unauthorized user's receiver cannot display pictures at all because the receiver cannot retrieve scrambling keys, and hence the user cannot enjoy a program even to such a degree as to perceive its feeling as in analog broadcasting systems, and thus the user cannot decide as to whether to make contract or not with viewing the program to some extent, which prevents the provider of the program from offering effective invitation to the user.

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