Abstract: In a data multiplexing device which multiplexes and transmits the transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream packets, a program distribution system, a program transmission system, a pay broadcast system, a program transmission method, a conditional access system, and a data reception device according to the present invention, by generating a scramble key Ks corresponding to one or more data elements among the plurality of data elements constituting a program and by scrambling each data element, an audience can subscribe for each data element.

Abstract: In a data multiplexing device which multiplexes and transmits the transport stream packets of program data consisting of a plurality of data elements constructed in the form of transport stream packets, a program distribution system, a program transmission system, a pay broadcast system, a program transmission method, a conditional access system, and a data reception device according to the present invention, by generating a scramble key Ks corresponding to one or more data elements among the plurality of data elements constituting a program and by scrambling each data element, an audience can subscribe for each data element.

Abstract: Remote editing is carried out between video apparatuses connected via a communication network without producing deviation between transmitted audio and/or video and time code data. An editing machine 18 outputs a time code sense command to a terminal equipment 12, and the terminal equipment 12 multiplexes the time code sense command in a transmission packet and transmits the same to a terminal equipment 42 via a communication network 30. The terminal equipment 42 receives the transmission packet, demultiplexes the time code sense command, and outputs the same to a VTR apparatus 46. The VTR apparatus 46 outputs the audio and/or video data and the time code data to the terminal equipment 42 according to the control data. The terminal equipment 42 multiplexes the audio and/or video data and time code data input from the VTR apparatus 46 in the transmission packet and transmits the same to the editing system 10.

Abstract: A data transmission method for transferring predetermined transmission data between a slave side and a master side to which the predetermined transmission data is transmitted and which are connected through a predetermined communications network, wherein the master side generates an independent synchronization clock signal and transmits synchronization data showing the frequency of the independent synchronization clock signal to the slave side, the slave side generates a slaved synchronization clock signal synchronized with the synchronization clock signal of the master side based on the synchronization data transmitted from the master side and generates the transmission data and transmits it to the master side in synchronization with the generated slaved synchronization clock signal, and the master side receives the transmission data transmitted from the slave side in synchronization with the independent synchronization clock signal.