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Method for preventing copying of digital video disks

  • US 6,167,136 A
  • Filed: 05/16/1997
  • Issued: 12/26/2000
  • Est. Priority Date: 05/16/1997
  • Status: Expired due to Term
First Claim
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1. A method for securely storing a series of frames of analog information which occur at a synchronous rate comprising:

  • generating an analog noise signal;

    sampling said analog noise signal at said synchronous rate to produce a sample each frame;

    combining each sampled noise signal with said analog information signal of each frame to produce a combined signal;

    digitizing said combined signal;

    deriving a digital representation of said sampled analog noise signal;

    encrypting said digitized combined signal; and

    creating a plurality of frames of said encrypted digitized signal, each frame having a header with a frame identification field and said digital representation of said sampled noise signal; and

    storing said plurality of frames of said encrypted digitized signal on a data storage medium.

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