"The startup–RPX Corp.–is a so-called defensive patent aggregator. RPX–short for Rational Patent–aims to reduce the costs associated with non-practicing entities (NPEs). These NPEs–known as patent trolls to you and me–acquire the rights to patents and then launch lawsuits. RPX is more diplomatic in its press release, but that’s the general idea. IBM and Cisco are signed up with RPX, which has funding from Kleiner Perkins Caufield & Byers and Charles River Ventures. I had a briefing scheduled for today, but it appears the Wall Street Journal has spilled the beans."