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Method for encrypting and embedding information in a video program

  • US 5,581,614 A
  • Filed: 01/18/1994
  • Issued: 12/03/1996
  • Est. Priority Date: 08/19/1991
  • Status: Expired due to Fees
First Claim
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1. A method for encrypting information having a header portion and a body portion comprising the steps of:

  • reading a current month from a clock having an output as a function of time;

    setting an odd/even month indication in the header portion to odd, if the current month read from the clock is an odd month, otherwise, setting an odd/even month indication in the header portion to even, if the current month read from the clock is an even month;

    generating a first key based on the current month read from the clock if the odd/even indication is odd and the current month read from the clock is odd or if the odd/even indication is even and the current month read from the clock is even, otherwise generating the first key based on a month previous to the current month read from the clock if the odd/even indication is odd and the current month read from the clock is even or if the odd/even indication is even and the current month read from the clock is odd;

    using the first key for encrypting the body portion to generate an encrypted body portion; and

    embedding the encrypted body portion and the header portion within a video signal to form a composite video signal.

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