Just what do you think a patent troll is? Legality doesn't not make you a patent troll. Buying patents you have no intention of employing in a product, and preventing others from doing so; sitting on it with the only purpose to sue those who infringe is being a patent troll. It is a perversion of the original purpose of patents.Capitalism needs to clean up its act, getting rid of those who game the system while doing nothing to add value. Day trading, patent trolling, etc.