TELEVISION SIGNAL TRANSMISSION SYSTEM

摘要

PURPOSE:To improve the scramble effect by adding a key code to the end part of a broadcast so as to disable a program for watching on real time if a signal is not recorded once on a VTR or the like. CONSTITUTION:The key code is added to the end part of the broadcast. Then a scrambled broadcast signal is recorded on the tape of a VTR and the key code is obtained finally. The key code is read at reproduction and the reproducing signal is descrambled based thereupon. Thus, the program cannot be viewed on real time.