ファイル共用ソフト利用ですね。
日本でも野放しじゃないんでしょうが。
http://today.reuters.com/news/newsArticle.aspx?type=internetNews&storyID=2005-06-22T123630Z_01_L22397845_RTRIDST_0_NET-SPAIN-CHILDPORN-DC.XML
In two parallel operations, 650 officers searched 188 homes and found evidence of child pornography distribution across the Internet using "peer-to-peer" (P2P) software and a system of passwords.
