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British Telecommunications is the latest company to file a lawsuit against Valve. BT has filed the lawsuit in Delaware, a location that apparently favors patent holders. BT claims that Valve infringes on the Gittins, Newton, Buckley, and Beddus patents.

Fortunately, this handy legal document breaks down what each of these patents is and how they may related to Valve.
GittinsNewtonBeddusBuckley

At the very least, BT should also be suing services such as YouTube, Twitch, Facebook, Hitbox, and like every single live cam porn site in the world. Good luck with the lawsuit there, BT.