That would depend on what country you're from if from the States its illigal to swap/share/download files according to the RIAA. Other countries though may have different laws. If using P2P the best thing to do is keep the amount of files you share very low. If sharing over a 1000+ files the RIAA can sue you. Its illigal to download copyrighted material no matter what it is whether its music/films/software and or games.