divVerent wrote:Exactly that person IS responsible, as he is (unknowingly, but that does not matter) committing a copyright violation.
That's why I asked for source for this particular statement. If some 3rd party enterprise sells you silver disks you can't be punished unless you know that they were illegal from the start.
The most simple example: you have a bike, bike was stolen, a person at the bazaar buys a bike without knowing it was stolen, you notice your bike and the city and call the police, you PROVE that it is your bike (eg. by id on the frame) , bike is confiscated from that person, but he isn't punished and investigation for the real thief begins.
The example, which would work for you: you buy drugs or prostitute (ok, it's legal in your country), but you're punished because you know that these actions are wrong.