イタリアではブロックできるようですね。
日本ではブロックできないとか、どこにあるかわからないと聞いていますが。
http://today.reuters.co.uk/news/articlenews.aspx?type=internetNews&storyID=2007-01-02T170523Z_01_L02273101_RTRIDST_0_OUKIN-UK-ITALY-INTERNET.XML
The decree, which comes into force almost immediately, requires Internet providers to set up a system that blocks child pornography Web sites from being viewed soon after the providers are notified of their existence.
