A system comprising a plurality of digital television signal receivers and a plurality of descrambling modules, each of said plurality of digital television signal receivers being coupled via an IEEE1394 bus to said plurality of descrambling modules enabling output of data from each of said plurality of digital television signal receivers to each of said plurality of descrambling modules, each of the receivers comprising: a tuner for receiving a digital television signal comprising a plurality of programs multiplexed in one data stream transmitted from a broadcasting provider among a plurality of broadcasting providers; a demodulator for demodulating said digital television signal; an interface for outputting said demodulated digital television signal to a descrambling module, which is adapted for performing a descrambling process unique to the broadcasting provider by which the digital television signal has been transmitted, and for inputting a descrambled digital television signal from said descrambling module, wherein said interface complies with the IEEE1394 standard; a demultiplexer for demultiplexing said descrambled digital television signal; and a decoder for decoding said demultiplexed digital television signal; and each of the descrambling modules comprising a descrambler for descrambling said demodulated digital television signal, inputted from one of said plurality of digital television signal receivers, by performing each a descrambling process unique to a different broadcasting provider; wherein each of the receivers or each of the descrambling modules comprises a Packet ID filter for extracting a desired program to be processed of the plurality of programs from the demodulated digital television signal by referring to a Packet ID and supplying only the extracted program to the descrambler of said descrambling module which is adapted for performing a descrambling process unique to the broadcasting provider by which the digital television signal has been transmitted. a tuner for receiving a digital television signal comprising a plurality of programs multiplexed in one data stream transmitted from a broadcasting provider among a plurality of broadcasting providers; a demodulator for demodulating said digital television signal; an interface for outputting said demodulated digital television signal to a descrambling module, which is adapted for performing a descrambling process unique to the broadcasting provider by which the digital television signal has been transmitted, and for inputting a descrambled digital television signal from said descrambling module, wherein said interface complies with the IEEE1394 standard; a demultiplexer for demultiplexing said descrambled digital television signal; and a decoder for decoding said demultiplexed digital television signal; and each of the descrambling modules comprising a descrambler for descrambling said demodulated digital television signal, inputted from one of said plurality of digital television signal receivers, by performing each a descrambling process unique to a different broadcasting provider; wherein each of the receivers or each of the descrambling modules comprises a Packet ID filter for extracting a desired program to be processed of the plurality of programs from the demodulated digital television signal by referring to a Packet ID and supplying only the extracted program to the descrambler of said descrambling module which is adapted for performing a descrambling process unique to the broadcasting provider by which the digital television signal has been transmitted.