http://internet.watch.impress.co.jp/cda/news/2007/05/28/15852.html
http://it.nikkei.co.jp/internet/news/index.aspx?n=AS3S0200X%2020052007
http://plusd.itmedia.co.jp/pcuser/articles/0705/18/news078.html
http://www.j-cast.com/2007/05/17007699.html
http://enterprise.watch.impress.co.jp/cda/security/2007/05/09/10225.html
http://internet.watch.impress.co.jp/cda/news/2007/05/07/15601.html