SUBSCRIBER AUTHORIZATING METHOD AND AUTHORIZATING SYSTEM

摘要

Subscriber authorizating method comprises the steps as following: setting the dynamic personal keys with a survival term which are shared by the headend and subscriber terminal; checking if the survival term reachs the ending time, if so, returning and sequentially checking the survival term of the dynamic personal keys after updating the dynamic personal keys of which the survival term is expired; or else, the headend implements encrypting, scrambling and authorizing for transport stream on the basis of the dynamic personal keys, subscriber terminals implement decrypting and unscrambling for the scramble transport stream on the basis of the dynamic personal keys. Accordingly, the present invention also provides a subscriber authorizing system. The invention can reduce the probability that unauthorized users watch the television programs using the cloned smart card, while the invention can reduce the economy loss resulted from maintaining the smart card by the operators.