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System and method for media authentication

  • US 20030188150A1
  • Filed: 03/24/2003
  • Published: 10/02/2003
  • Est. Priority Date: 03/28/2002
  • Status: Abandoned Application
First Claim
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1. A method for providing a content that comprises control information and data from a content provider to a user terminal, the method comprising:

  • calculating a first digest value of the content by the content provider;

    calculating a second digest value of the content on the user terminal;

    generating the control information that comprises the first digest value, for controlling a reproduction of the content, by comparing the first digest value with the second digest value;

    outputting the control information and the data, to the user terminal; and

    outputting key information to further control the reproduction of the content, by determining whether the control information is valid.

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