摘要:
The invention provides a conditional access system, wherein a conditional access client in a terminal has minimal functionality while a smartcard for use in the terminal incorporates user interaction and content authorisation functionality. The interface for user interaction between the smartcard and the conditional access client is generic. The invention enables addition or modification of conditional access functionality to the conditional access system by upgrading or replacing the smartcard, without requiring modifications to the terminal.
摘要:
The invention provides an improved conditional access system with efficient bandwidth usage on the interface between a receiver and a conditional access module. The conditional access system has a receiver, a selection module, a conditional access module and possibly a terminal. The conditional access module has a first memory for storing service identifiers of services and transmits one or more service identifiers to the selection module. The selection module receives an input signal from,the receiver and selects from the input signal those sub-signals as identified by the service identifiers and transmits the sub-signals to the conditional access module.