RPX Corporation (Rational Patent EXchange)(NASDAQ: RPXC) is an American worldwide provider of patent risk management services, offering defensive buying, acquisition syndication, patent intelligence and advisory services. Since the company was founded in March, 2008, RPX claims to have introduced efficiency to the patent market by providing a rational alternative to litigation. Based in San Francisco, By acquiring patents that pose potential problems and providing information on litigation, RPX seeks to reduce patent assertions directed at its clients. RPX provides a Defensive Patent Aggregation service to mitigate clients’ risk of litigation from non-practicing entities (NPEs) – also called patent trolls – which acquire patents for the sole purpose of licensing and asserting their patent rights. RPX identifies and purchases patent assets they identify as of high value, relevance and risk that could be used offensively against members of the companys client network. Depending on the situation, RPX may acquire assets from a third party or directly from an NPE. When necessary and possible, RPX will buy patent rights out of an active litigation.