CONDITIONAL ACCESS SYSTEM

摘要

FIELD: radio engineering, communication.SUBSTANCE: conditional access system has a host configured to receive an input data stream and deliver the input data stream to a conditional access module, the conditional access module being configured to process the input data stream and provide a corresponding output stream to the host, the host and the conditional access module being configured to contact each other in an authentication protocol upon detection of a code embedded in the output stream.EFFECT: preventing unauthorised access to information.12 cl, 3 dwg