| 摘要 |
PROBLEM TO BE SOLVED: To prevent the deletion and correction of duplication prevention control information with a frequency filter and simple replacement of an information signal by spectrum-spreading duplication prevention control information based on additive information obtained from a recording medium, extending a frequency band, superimposing it on a analog information signal in the same time and the same frequency, transmitting it and extracting a duplication prevention control signal incorporated in an receiving signal by a recorder. SOLUTION: A digital regenerative video signal component S2 is extracted from a signal S1 obtained by reproducing the information recorded on a disk 100, and supplied to a deciding part 12 and a copy prevention control signal extraction part 15. The decoding part 12 for deciding processes the digital regenerative video signal component to obtain an analog video signal S3 containing a vertical synchronizing signal, a horizontal synchronizing signal through a D/A converter 13. An SS copy prevention control signal generation part 16 spectrum-spreads the copy prevention control signal S4, and superimposes it on the analog video signal S3 to transmit it, and duplication prevention control for the video signal is performed. |
