System and method for document distribution
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United States of America Patent
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Apr 8, 2008
Grant Date -
N/A
app pub date -
Dec 21, 1999
filing date -
Apr 6, 1999
priority date (Note) -
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Abstract
Methods for transferring among key holders in encoding and cryptographic systems the right to decode and decrypt messages in a way that does not explicitly reveal decoding and decrypting keys used and the original messages. Such methods are more secure and more efficient than typical re-encoding and re-encryption schemes, and are useful in developing such applications as document distribution and long-term file protection.
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