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Navigating the Patent Thicket: Cross Licenses, Patent Tools, and Standard Setting
The author describes a patent thicket as an overlapping set of patent rights requiring that those seeking to commercialize new technology obtain licenses from multiple patentees. Industries such as semiconductors, biotechnology, computer software and the Internet are creating the thicket, the author contends.
Link
http://www.haas.berkeley.edu/~shapiro/thicket.pdf