You are right on the first part of your answer, bittorrent was not the first soucre of illegal entertainment but today, it is clearly the mostly used protocol to download torrent files on many illegal trackers. Now, I absolutely don't care about what people does with bittorrent, I am not fond of laws, even far from this, my topic concerns the idea that people who are not computing experts has about this incredible software. Your answers are quite interesting but it is obvious that all of you are aware of what bittorrent protocol is, this is not the case of my clients, especially the older ones. Since I've posted this topic, I had to make other lectures to clients on what it is and tell them that the idea of an illegal protocol is wrong and blablabla. Ok, it can be interesting to educate people like yottabit said but I don't remember being paid for that !! You are probably right but this is a difficult thing to do ! Thanks for your answers !