Enforcement and policing of licensed content using content-based identifiers
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United States of America Patent
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Aug 9, 2005
Grant Date -
May 2, 2002
app pub date -
Nov 15, 2001
filing date -
Apr 11, 1995
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Data files are distributed across a plurality of computers. The computers may form a network such as a content delivery network (CDN) or a peer-to-peer network. The network may operate as a TCP/IP network such as the Internet. Data files may represent may represent digital messages, images, videos or audio signals. For content-data items or files in the system-a name is obtained (or determined), where the name is based, at least in part, on a given function of the data in a data item or file. The given function may be a message digest or hash function, and it may be MD4, MD5, and SHA. A cony of a requested file is only provided to licensed (or authorized) parties. The system may check one or more computers for unauthorized or unlicensed content. Content is served based on a measure of availability of servers.
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