Nearly two dozen public-transit providers in Boston, Chicago, New York and other U.S. cities are facing lawsuits that they say are intended solely to force them into making settlements. Patent-assertion entities, which opponents call "patent trolls," increasingly are filing lawsuits against public entities, according to this article. "This type of litigation undercuts the purpose of the patent system and exploits the fact that public agencies are at a disadvantage in defending themselves," said U.S. Rep. Daniel Lipinski, D-Ill.

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