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Decryption system

  • US 7,286,667 B1
  • Filed: 09/15/2003
  • Issued: 10/23/2007
  • Est. Priority Date: 09/15/2003
  • Status: Active Grant
First Claim
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1. A method of decoding a selectively encrypted data stream at a digital television receiver device, comprising:

  • at the digital television receiver device, receiving the selectively encrypted data stream from a first source;

    at the digital television receiver device, receiving a set of clear packets from a second source, the set of clear packets containing data representing an unencrypted version of the encrypted packets present in the selectively encrypted data stream;

    detecting a plurality of encrypted packets forming a part of the selectively encrypted data stream;

    substituting the clear packets from the second source for the encrypted packets to form a clear data stream, such clear data stream thereby being produced without decryption of the encrypted packets present in the selectively encrypted data stream by the digital television receiver device;

    filtering a set of packets from the selectively encrypted data stream based upon packet identifier values to produce a stream of packets having clear packets and encrypted packets; and

    substituting the clear packets from the second source for the encrypted packets into the stream of packets in place of the encrypted packets to produce a stream of clear data.

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