Method, system and program product for managing a size of a key management block during content distribution
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United States of America Patent
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-
Aug 15, 2006
Grant Date -
Oct 23, 2003
app pub date -
Apr 18, 2002
filing date -
Apr 18, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method, system and program product for managing a size of a key management block (KMB) during content distribution is provided. Specifically, a first KMB corresponding to a first subtree of devices is received along with content as encrypted with a title key. If a size of the first KMB exceeds a predetermined threshold, a second subtree will be created. A second KMB corresponding to the second subtree of devices will then be generated. The second KMB contains an entry revoking the entire first subtree of devices and, as such, is smaller than the first KMD. Any compliant devices from the first subtree are migrated to the second subtree.
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