P2P
http://internet.watch.impress.co.jp/cda/news/2005/03/24/6974.html
http://internet.watch.impress.co.jp/cda/event/2005/03/08/6754.html
http://www.itmedia.co.jp/news/articles/0410/07/news012.html
http://www.itmedia.co.jp/news/articles/0410/08/news028.html