| 摘要 |
The method involves modification of a video signal of a VTR device, in which signal parameters of the video signal x(t) to be recorded on the recording medium (13) are influenced by scaling functions k(t) in such a way that, when the video signal recorded on the recording medium (13) is played back for the first time, a first copied video signal w1(t) responded to as correct is produced and, when the first copied video signal w1(t) recorded on another magnetic recording medium (23) is played back, a second copied video signal w2(t) responded to as definitely disturbed is produced. <IMAGE> |
