Conditional access system for broadcast digital television

Details Conditional access system for broadcast digital television Conditional access system for broadcast digital television

1999-07-15

2009-02-17

Moise, Emmanuel L (Department: 2137)

Cryptography

Video cryptography

Video electric signal modification

C380S201000, C380S239000, C380S241000, C380S282000, C713S185000, C726S028000, C726S029000, C725S006000, C725S031000

Reexamination Certificate

active

07492897

ABSTRACT:
A method for managing access to scrambled broadcast or transmitted events received from a variety of service providers (including broadcast television networks, cable television networks, digital satellite systems). Each service provider employs the same public key for descrambling the access information message thereby permitting a user to access events from various service providers without changing the smart card. The method may also be expanded to manage access to a scrambled package of broadcast events.

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