About 20 years, as far as I can tell. There is also a high level of Internet service provider cooperation. http://www.zdnet.com/article/japans-isps-agree-to-ban

About 20 years, as far as I can tell. There is also a high level of Internet service provider cooperation. http://www.zdnet.com/article/japans-isps-agree-to-ban-p2p-pirates/ http://www.zdnet.com/article/japans-isps-agree-to-ban-p2p-pi...