DEVICE AND METHOD FOR SELECTIVELY SUPPLYING ACCESS TO A SERVICE ENCRYPTED USING A CONTROL WORD, AND SMART CARD

摘要

Device 120 for selectively providing access to the service 202, which is encrypted using a control word, there is provided a smart card (300) and method. Service 202 is received with the entitlement control message including a designator for the validity of the authentication data and the authentication data (ECM) (203). Service is decrypted only when being ECM (203) is found to be valid. Service 202 may be stored in a storage medium such as a DVD. It supplies a specified ECM in the recording means (215) - ECM transcoding module 211 obtains the authentication data from the ECM (203), and comprises the authentication data. Device - specified ECM may be encrypted with a key specified by the device 120 and / or include an identifier for the device 120.