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Partial encryption and PID mapping

  • US 7,151,831 B2
  • Filed: 01/02/2002
  • Issued: 12/19/2006
  • Est. Priority Date: 06/06/2001
  • Status: Active Grant
First Claim
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1. A method of producing an encrypted television signal, comprising:

  • receiving a plurality of encrypted samples of the television program, the samples being encrypted under a first encryption method;

    receiving a duplicate of the plurality of encrypted samples of the television program, the duplicate of the plurality of encrypted samples being encrypted under a second encryption method; and

    combining the plurality of encrypted samples and the duplicate of the plurality of encrypted samples with an unencrypted portion to produce the encrypted television signal as an output.

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