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Method and apparatus for recording of encrypted digital data

  • US 7,239,704 B1
  • Filed: 02/11/1999
  • Issued: 07/03/2007
  • Est. Priority Date: 02/13/1998
  • Status: Expired due to Term
First Claim
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1. A method of recording transmitted digital data, comprising:

  • receiving the transmitted digital data comprising scrambled data and encrypted transmitted digital information;

    decrypting the encrypted transmitted digital information to obtain transmitted digital information, wherein the transmitted digital information comprises a control word, and wherein the control word is used to descramble the scrambled data;

    re-encrypting the transmitted digital information using a recording encryption key;

    storing the re-encrypted transmitted digital information and the scrambled data by a recording means on a recording support medium;

    encrypting the recording encryption key by a recording transport key; and

    storing the encrypted recording encryption key to the recording support medium,wherein at least one of the recording encryption key and the recording transport key is stored on a portable security module associated with the recording means.

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