It is more complicated, first at all nobody knows how many P2P users there are, 5,000,000 is only an estimative and probably there are many times more, 20,000,000 ??? who knows? 1) When you are conected to the network you are not conected to those 5,000,000, you are connected to only some hundreds or thounsands users, your neighbour that is also conected is conected to other hundreds or thounsands of users that not neccessarly are the same, can be other subset of the 5,000,000., and who is connected to you is always variable, some last for a long time, others for only few minutes, is a very dynamic scenario. 2) It is common to see users with IPs 0.0.0.0 or 0.0.10.0. 3) You are connected to users all around the world, what is illegal in one country can be legal in another country. Downloading MP3 is legal in some countries. For porn, in some coutries the legal age is 18 years, in other countries is only 16 years. 4) How do you or the local law can know if a file is illegal or legal, some file are obvious as Microsoft XP, but other not so common files how anyone can know? 5) Even if you are downloading the illegal Windows, you are downloading by chunks, and how anyone can know that you are downloading the Windows or a junk file with the name Windows. There's a lot of junk, trash and virus that people put trying to fight P2Ps. 6) There are many files with the names changed or wrong names, you only can know once you downloaded it. 7) If you do a search for "kawecki" with some P2P software, you will find many mine products and many of them start with Renderosity, but you will found products that were never sold at Renderosity, someone added the name Renderosity to my name. You can find mine freebies that look as if were products, someone downloaded and changed the name. And I don't put any restriction of distribution to my freebies, I also uploded some for test purpouses. 8) Many artists upload MP3 of their work, so many MP3 are not illegal.

Stupidity also evolves!