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CONTENT ENCRYPTION USING AT LEAST ONE CONTENT PRE-KEY

  • US 20090296940A1
  • Filed: 05/28/2009
  • Published: 12/03/2009
  • Est. Priority Date: 05/30/2008
  • Status: Active Grant
First Claim
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1. A method for encrypting content, said method comprising steps performed by a computing apparatus of:

  • receiving the content in a device, said content being associated with a unique content identification (ID) and copy control bits;

    storing at least a portion of the content, thereby associating the content with one of a first copy control state and a second copy control state;

    creating a first content pre-key using a local storage key unique to the device as a key to encrypt the content ID of the contentcreating at least one of a second content pre-key using the first content pre-key as a key to encrypt the first copy control state and a third content key using the second content pre-key as a key to encrypt the second copy control state; and

    encrypting the content using one of the second content pre-key and the third content key.

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