I do not understand this section: Here's where Mr Myhrvold's Intellectual Ventures comes in. Intellectual Ventures owns a huge portfolio of patents. Quite possibly they also have some sort of patent that covers streaming music over the internet. Intellectual Ventures makes money through a sort of protection racket that helps Spotify defend themselves against companies like PacketVideo

How can Spotify use IV's patent pool defensively against PacketVideo, a patent troll when they PacketVideo doesn't do anything other than sue? The defensive aspect only comes into play against companies who have other lines of revenue that you can threaten... thoughts?