[bradknowles]

In many European jurisdictions, you are criminally liable for anything that makes it onto your systems, regardless of how it got there.

So, the OP has just given people a whole new way of making themselves liable for illegal content, just by running the P2P software in question.

In most cases, the police aren't interested in hauling a service provider into jail, they want to haul in the person who put that content there. But this does make a nice little lever that the police can use against any service provider.