[NYTimes] Battling Internet Censorship Must Evolve, Study Says

A detailed study of Internet censorship in China and Iran shows that blocking techniques are changing rapidly and are becoming significant new obstacles for news organizations, governments and businesses.

The study, being published on Tuesday, focuses on Internet blocking faced by Iranian and Chinese visitors to BBC Web sites during periods of political unrest in the two countries over the last two years.

The study documents the activities of firewall censorship during a variety of political events, including anniversaries of events like the Tiananmen Square protests.