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Rendering digital content in an encrypted rights-protected form

  • US 6,775,655 B1
  • Filed: 11/24/1999
  • Issued: 08/10/2004
  • Est. Priority Date: 03/27/1999
  • Status: Expired due to Term
First Claim
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1. A method for rendering digital content in an encrypted rights-protected form, the method comprising:

  • determining, by a rendering application, that the digital content is in the encrypted rights-protected form;

    invoking, by the rendering application, a Digital Rights Management (DRM) system, the DRM system including a license store having at least one digital license stored therein, each license corresponding to a piece of digital content and including a decryption key (KD) for decrypting the corresponding digital content;

    locating, by the DRM system, each license in the license store corresponding to the digital content to be rendered;

    selecting, by the DRM system, one of the located licenses;

    obtaining, by the DRM system, (KD) from the selected license;

    decrypting, by the DRM system, the digital content with (KD); and

    returning, by the DRM system, the decrypted digital content to the rendering application for actual rendering, wherein the DRM system further includes a public key (PU) and a private key (PR), wherein the at least one license corresponding to the digital content includes a decryption key (KD) encrypted with the public key (PU) of the DRM system (PU(KD)), and wherein obtaining (KD) from the selected license comprises;

    obtaining, by the DRM system, (PU(KD)) from the selected license; and

    decrypting, by the DRM system, (PU(KD)) with (PR) to produce (KD).

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