"Piratpartiet" (The Pirate Party) mainly got it's name from "Piratbyrån" (The Pirate Bureau), which was a think tank for information, culture, and intellectual property (and started TPB). They in turn took their name, tongue-in-cheek, from the lobby group "Antipiratbyrån" (The Anti-Piracy Bureau), which is similar to the MPAA or BSA. Also the modern definition of pirate is basically "doing something without a permit", as in pirate radio, pirate recording, pirate copy etc. This differs from the old definition which is "to attack" something.