Like Google's own License on Transfer Network, PAX is meant to deter patent trolls by making them the patents covered by the network free to use. In short, the companies that join PAX are are agreeing not to sue each other over software patents related to Android and Google applications. The agreement also allows Android partners to use each other's software patents royalty-free on those same platforms. The list of companies who are already on board with PAX includes some of the big names you might expect, like Samsung, LG, Foxconn, HTC and others. According to Google VP of Android operations Jamie Rosen, the network already covers 230,000 patents worldwide and anyone can join.