System and method for descrambling transport stream data

PURPOSE: A system and method for descrambling transport stream data are provided to descramble TS packet data inputted to a point of deployment module. CONSTITUTION: A system for descrambling transport stream data includes a transport stream packet input unit(20), a descrambling controller(30), and a descrambler(50). The transport stream packet input unit judges whether or not the transport stream data is descrambled using a header value of the TS packet data and outputs the judged result and TS packet data. The descrambling controller outputs a control signal to the TS packet input unit to allow the TS packet input unit to read the TS packet data and outputs a scrambling judgement signal according to the judged result. The descrambler judges whether or not the TS packet data is scrambled according to the scrambling judgement signal to vary descrambling process.