by paco

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. For a considerable fee, a company can access Intellectual Venture's storehouse of patents and use them defensively against companies claiming patent infringement.

It's like the mafia, you have to pay them for protection.