Patent ID: 7649993

Claim:
A video-signal processing system for processing a video signal, comprising: encrypting means for encrypting the video signal and a first frame number, which indicates a frame number of the video signal to be transmitted, based on a numeric sequence; transmitting means for transmitting unencrypted said first frame number, the video signal encrypted by the encrypting means, and the first frame number encrypted by the encrypting means; receiving means for receiving the unencrypted first frame number, the encrypted video signal, and the encrypted first frame number transmitted by the transmitting means; decrypting means for decrypting the encrypted first frame number and the encrypted video signal received by the receiving means, based on a numeric sequence; and generating means for generating an initializing pulse based on a second frame number indicating a frame number in a receiver side, the second frame number being generated by decrypting the encrypted first frame number by the decrypting means, and on the unencrypted first frame number received by the receiving means, wherein the decrypting means initializes the numeric sequence based on the initializing pulse generated by the generating means.