Signal processing apparatus and methods

DC CAFC
  • US 8,559,635 B1
  • Filed: 05/24/1995
  • Issued: 10/15/2013
  • Est. Priority Date: 11/03/1981
  • Status: Active Grant
First Claim
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1. A method for controlling the decryption of encrypted programming at a subscriber station, said method comprising the steps of:

  • receiving encrypted digital programming, said encrypted digital programming having an encrypted digital control signal;

    detecting said control signal;

    passing said control signal to a decryptor that decrypts encrypted digital data at said subscriber station;

    decrypting said control signal;

    decrypting said encrypted digital programming to form decrypted programming based on said control signal; and

    presenting said decrypted programming to a viewer or listener.

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