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Method and apparatus for playing back content based on digital rights management between portable storage and device, and portable storage for the same

  • US 7,779,479 B2
  • Filed: 06/01/2005
  • Issued: 08/17/2010
  • Est. Priority Date: 06/01/2004
  • Status: Expired due to Fees
First Claim
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1. A method of playing back content using a portable storage, the method comprising:

  • requesting the portable storage to transmit a right to play back content protected through digital rights management (DRM);

    receiving the right to play back the content protected through DRM from the portable storage; and

    informing the portable storage of completion of a playback of the content protected through DRM using the right when the playback is completed,wherein the right to play back content comprises permission information which is included in and obtained from a rights object, andwherein the informing the portable storage of completion of a playback updates at least one constraint included in the rights object stored in the portable storage by transmitting only a portion of the rights object, and not the entire rights object, to the portable storage.

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