System and method for secure distribution and evaluation of compressed digital information
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United States of America Patent
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-
Aug 8, 2006
Grant Date -
Jul 10, 2003
app pub date -
Jan 9, 2002
filing date -
Jan 9, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A method for controlling access to digital information is performed based on a plurality of decryption keys sent by the information provider. A first type of decryption key instructs a user's host system to reproduce the digital information in accordance with a first level of reproduction quality degradation. Additional keys may specify other degradation levels. The quality of the digital information may be degraded based on a time condition or a use condition. Alternatively, only a portion of the information may be made viewable by a user. In order to obtain full and unrestricted access, the user must obtain a type of decryption key from the provider which removes all previous limitations on reproduction quality degradation.
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