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Extending the DRM realm to external devices

  • US 8,166,300 B2
  • Filed: 05/08/2007
  • Issued: 04/24/2012
  • Est. Priority Date: 05/12/2006
  • Status: Active Grant
First Claim
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1. A method for rendering content, comprising the steps of:

  • setting up a communication channel between a proxy rendering server of a mobile device and an external rendering server of an external device;

    authenticating at least the external rendering server and upon successful authentication transferring a key from the proxy rendering server to the external rendering server;

    transferring the content encrypted with the transferred key from the proxy rendering server to the external rendering server for rendering the content;

    where the rendering of the content is performed in one of two modes, either in a preprocessing mode for performing processing of the content by the mobile device prior to transferring the content to the external rendering server, or in a non-preprocessing mode for performing processing of the content by the external device subsequent to receiving the content, and that a digital rights management (DRM) agent for digitally managing permissions associated with the content is only present in the mobile device and not in the external rendering server to relieve the external rendering server of a need to enforce DRM rights associated with the content, where the external rendering server is not part of same physical device or software control system as the mobile device;

    where the preprocessing mode implemented by the mobile device further comprises the steps of;

    authenticating at least the external rendering server via an authentication protocol, and upon successful authentication;

    transferring the temporary key from the proxy rendering server to the external rendering server via a key provisioning protocol;

    accessing decrypted content from the DRM agent;

    preprocessing the decrypted content;

    re-encrypting the decrypted and preprocessed content; and

    transferring the re-encrypted content to the external rendering server for decryption and rendering of the content; and

    where the non-preprocessing mode implemented by the mobile device further comprises the steps of;

    obtaining the Content Encryption Key from the DRM agent of the mobile device;

    authenticating at least the external rendering server via an authentication protocol;

    and upon successful authentication;

    transferring the Content Encryption Key from the proxy rendering server to the external rendering server via a key provisioning protocol;

    accessing encrypted content from a file system in the mobile device; and

    transferring the encrypted content to the external rendering server for decryption and rendering of the content.

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