A CONDITIONAL ACCESS SYSTEM FOR BROADCAST DIGITAL TELEVISION

摘要

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 (50, 52), 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 (42a, 42b). The method may also be expanded to manage access to a scrambled package of broadcast events.