The World Wide Web was founded on the idea of peer to peer (P2P) networking with direct communication between machines and users, but for various reasons the internet evolved more into a broadcast or client/server model. P2P revived around 1999 with Napster and then the BitTorrent protocol released in 2001, but this was a mixed blessing given its association with piracy and especially illicit music streaming. By 2009, the volume of P2P traffic was in steep decline again at the time online video was arising as a centrally driven unicast service. But most recently the proliferation of online video has given a new lease of life once more to P2P distribution in the guise of P2P CDNs, which promise to…