| 摘要 |
Disclosed is a method and apparatus provided on a game software broadcasting system for protecting the broadcast game software against unauthorized reception after the prescribed period of authorized reception expires. The method and apparatus allows the subscriber to receive and use the broadcast software within the prescribed period of authorized reception, and beyond that period the subscriber will not able to receive correctly decoded data of the broadcast software. The method and apparatus uses a timer on the transmitting site for clocking off the encoding process and uses another timer on the receiving site for clocking off the decoding process. The operating frequency of the decoding clock signal is prescribed with a specific deviation from that of the encoding clock signal. The deviation is prescribed based on the period of authorized reception given to the subscriber. The decoding clock signal is initially set in synchronization with the encoding clock signal at the time the service begins. The deviation will cause the decoding clock signal to be out of synchronization after the prescribed period of authorized reception expires, thereby causing the receiving site unable to decode the received data of the broadcast software. To continue the authorization, the renewal can be made on the line by setting a resetting signal to reset the decoding clock signal back into synchronization with the encoding clock signal.
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