Uniloc, perhaps best known as Patent Troll in Chief, suffered a pretty devastating blow today. The company has long asserted that its "software activation" patent that's beguiled everyone from Microsoft (to the tune of $388 million) to Electronic Arts gives it clearance to sue just about anyone who uses a form of online authentication for software. Until now, according to the Kansas City Business Journal. The Patent Trademark and Appeals Board has ruled that Uniloc's patent number 5,490,216 is invalid via an inter partes review (IPR). Essentially an IPR is a way for inventors to challenge a patent without getting federal courts involved.