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patent troll noun

  /ˈpætənt ˌtɹoʊl/ , /ˈpætənt ˌtɹəʊl/
  • (patent law, informal, derogatory) A company, person, etc., that owns and enforces patents in an aggressive and opportunistic manner, often with no intention of producing, marketing, or promoting the subjects of the patents.
 Patenttroll
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