Controlling access to data in a data processing system
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United States of America Patent
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Sep 21, 2010
Grant Date -
Mar 13, 2008
app pub date -
Oct 31, 2007
filing date -
Apr 11, 1995
priority date (Note) -
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Abstract
Access to and delivery of licensed content is controlled using content names that were determined based on the content. A name for a data item is obtained, the name having been determined based at least in part on the data which comprise the contents of the data item. Access to the data item is authorized based at least in part on the name. Once authorized, access may be granted from more than one computer. The name may have been determined using a hash or message digest function such as MD4, MD5 or SHA. The data item may comprise a file, a portion of a file, a page in memory, a digital message, a digital image, a video signal or an audio signal.
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