China: We don't censor the Internet. Really

While many countries block off some Web sites, China has long drawn heightened scrutiny because of the breadth and sophistication of its Internet censorship.

Which is why it came as a surprise on Tuesday when a Chinese government official claimed at a United Nations summit here that no Net censorship existed at all.

The only problem: Few cases of Net censorship are as carefully and publicly documented as the Great Firewall of China. A study by researchers at Harvard Law School found 19,032 Web sites that were inaccessible inside China.

A report from a consortium of British, American and Canadian universities concluded: "China's Internet-filtering regime is the most sophisticated effort of its kind in the world. Compared to similar efforts in other states, China's filtering regime is pervasive, sophisticated and effective."