Data transmitter, receiver and transmitting and receiving system

The present invention is a plurality of received program data and video and audio information to a public ECM recorded onto the recording medium. Record the location of the program is written in the management table. When the desired program in reproducing the recorded program, ECM is also reproduced together with the video and audio data. EMM data and specific information required for restoring the program by using the broadcast wave sending. To descramble the reproduced video and audio data, ECM and has been reproduced using the received EMM. Since the specific information EMM is the latest information, so even if the time between the playback time and the recording time lag, the reliability of the conditional access is not caused by deterioration.