| 摘要 |
PROBLEM TO BE SOLVED: To prevent illegal analog copy and digital copy, to prohibit stepwise generation copy and to take measure to prevent illegal copy simultaneously in both of analog and digital copy. SOLUTION: At the time of reproducing digital video data recorded on an optical disk D being a signal recording medium, copy managing information of recording control information arranged within the TOC(table of contents) of the optical disk D and each header part of a data sector is read by copy managing information read circuits 17, 18, and discriminated by a copying circuit information discriminating circuit 19. Based on this copying managing information, a signal for preventing illegal copy encoded in plural bits is generated by a protect signal generation circuit 20. A mixing circuit 24 executes processing for inserting to a prescribed horizontal period within the vertical retrace line period of the analog video signal, such as the 20- nunbered H and 283-numbered H horizontal period, with respect to an analog video signal obtained by D/A converting the digital video data by a D/A converting circuit 23. |
