Copy prevention method and apparatus of a digital recording/reproducing system employing a marker including copy protection information and code data for descrambling

  • US RE37,052 E1
  • Filed: 06/12/1998
  • Issued: 02/13/2001
  • Est. Priority Date: 12/08/1994
  • Status: Expired due to Term
First Claim
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1. A copy prevention method of a digital magnetic recording/reproducing system comprising:

  • an audio and video signal transmitting process of encrypting a marker formed by a control word for scrambling audio and video bit strips and copy prevention information for preventing an illegal copy by means of an encoding key, and multiplexing said marker with said audio and video bit strips scrambled by said control word, and an audio and video signal receiving/recording process of detecting said marker from said transmitted bit strips, decrypting and analyzing the detected marker by means of an encoded said encoding key to determine whether copy is permitted or not, updating said detected marker to be recorded on a video tape, and generating said control word from said marker to perform a descrambling and supply the audio and video signals to be displayed on a monitor.

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