Encrypted media key management
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United States of America Patent
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Jul 11, 2006
Grant Date -
Oct 31, 2002
app pub date -
Jul 10, 2001
filing date -
Feb 21, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A key or licence management system for the secure online distribution of digitized audio-visual works ('media') using encryption techniques. Encrypted media is stored on a media server while the encryption keys are stored on a media key server. Users acquire rights from online retailers to obtain from the media key server keys corresponding to the media they wish to play. The key server encrypts keys before releasing them, preferably with the user's public key using a public key encryption algorithm. Keys are stored in volatile memory at the user's client device and thus the user is in receipt of the key just in time to play the media.
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