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=Definition=
<section begin=trolls />
No agreed-upon definition of patent troll exists. The term patent troll is used interchangeably with the terms non-practicing entities (NPEs) and patent assertion entities (PAEs). Despite similar sounding names, several key differences exist between the three terms.
Patent trolls may also target a slew of companies that tangentially intersect the sphere of the patent. One famous example of a patent troll is MPHJ Technology Investment, who claimed to have patents that cover any networked "scan-to-email" function. MPHJ sent demand letters to more than 16,000 small businesses, each letter demanding license fees of at least $1000 per worker.
<section end=trolls />
Top 10 PAEs in 2015, according to [http://unifiedpatents.com/2015-year-end-report/ Unified]

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