Thomson Reuters The St. Regis Mohawk Tribe sued Amazon and Microsoft for patent infringement. The lawsuit is part of a legal gambit in which the tribe acquired patents from SRC Labs, and then invoked its right to sovereign immunity, which could shield SRC and the tribe from counter-challenges. One federal judge invalidated a similar deal and suggested companies were "renting" sovereign immunity. A Native American tribe has sued Amazon and Microsoft for patent infringement. The St.