| 摘要 |
A service-on-demand system (1) with a set-top box (2) which is connected to the service-on-demand system (1) and includes a smart-card interface (3) and a decoder (5) which can read and decode information stored on a smart card (4) inserted by a user into the interface (3), and with a controller which can permit or block access to the service-on-demand system (1) depending on the decoded information is characterized in that input means (6) are provided for enabling the user to enter a secret number, and that the decoder (5) of the set-top box (2) is granted access to the inserted smart card (4) for reading and decoding the information stored thereon only if a correct secret number was entered. Unauthorized access to the system can thus be prevented with a higher degree of certainty than in conventional systems. The sensitive data stored on the smart card are additionally protected against unauthorized readout by a password.
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