Patent ID: 7751561

Claim:
A multiple partial encryption device, comprising: an input for receiving an unencrypted video signal; a first encrypter that produces from the unencrypted video signal a first encrypted video signal, the first encrypted video signal comprising a duplicate copy of at least a portion of the unencrypted video signal which has been encrypted using a first encryption method; a second encrypter that produces from the unencrypted video signal a second encrypted video signal, the second encrypted video signal comprising a duplicate copy of at least a portion of the unencrypted video signal which has been encrypted using a first encryption method; wherein, the first and second encrypted video signals comprise two encrypted versions of the same unencrypted video signal; a multiplexer that combines selected segments of the unencrypted video signal with at least a portion of the first encrypted video signal and at least a portion of the second encrypted video signal to provide a partially multiple encrypted video signal as an output signal therefrom; and wherein the selected segments of the unencrypted video signal together with either one of the at least a portion of the first encrypted video signal or the at least a portion of the second encrypted video signal contains all video contained in the unencrypted video signal.