Systems, structures, and methods for decrypting encrypted digital content when a rights management server has been decommissioned
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United States of America Patent
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Aug 4, 2009
Grant Date -
Jan 27, 2005
app pub date -
Aug 1, 2003
filing date -
Jun 27, 2003
priority date (Note) -
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status (Latency Note)
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Abstract
A method is disclosed for rendering content encrypted according to a cryptographic key, where the content has corresponding rights data including a decryption key (KD) for decrypting the encrypted content, and where (KD) in the rights data is encrypted according to a public key of a rights management (RM) server (PU-RM) to result in (PU-RM(KD)). The RM server normally delivers (KD) within a license, but upon being decommissioned can no longer issue such license. In the method, a notification is received that the RM server has been decommissioned, and thereafter an attempt is made to render a piece of content. Such content is determined to be protected to the decommissioned RM server, and a request is sent to the decommissioned RM server for the content key (KD) for the content rather than any license. Thereafter (KD) is received from the decommissioned RM server.
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