Importance

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Abstract

A program data (ATji) corresponding to a scrambled pay program signal, subscribed program data (BTji) representing a program signal subscribed by a subscriber and the scrambled program signal are demodulated by a demodulator. The subscribed program data (BTji) is detected by a data detector and the program data (ATji) is detected by a common data detector. A subscription state discriminating circuit compares the subscribed program data (BTji) with the program data (ATji) and discriminates the program subscription state of the subscriber. A random number generator generates a descrambling signal for descrambling the scrambled program signal when an output signal from said subscription state discriminating means represents that the subscriber has subscribed to the program. A display displays the nonsubscription state when the output signal from said subscription state discriminating means represents that the subscriber has not subscribed to the program.

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First Claim