System and method for securely updating copy-protected media
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United States of America Patent
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Aug 19, 2003
Issued Date -
N/A
app pub date -
Aug 23, 1999
filing date -
Apr 24, 1998
priority date (Note) -
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Abstract
A system and method for updating old blank media onto which newer content is sought to be copied, to reduce the risk of unauthorized copying of new content onto old unupdated media. A computer system executes a method in which one or more calculate media key commands (CMKC) are written onto a blank recording medium, with the CMKCs defining an old media key. One or more CMKCs defining a new media key is associated with broadcast content, with the new CMKCs effectively revoking one or more device keys of a suspected pirate device. A legitimate player/recorder can decrypt the media keys from both the medium and the content, and then encrypt the content using the new media key and encrypt the first unconditional CMKC in the new CMKCs with the old media key. The encrypted content and the (now conditional) CMKC are recorded on the medium.
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