That's the basic idea - but there is a new thing called Bit-torrent (?) where most people are simultaneously up & down loading bits of files - at least one site must have a full copy of any particular so that everybody knows how to put the bits together - it is thus mainly peer to peer, but in all these peer to peer systems file sharing systems they usually need some sort of overall coordinating system. That point about the level of coordination is where the lawyers disagree.