Which countries filter internet content : reports from the Open Net Initiative

"... a synopsis of the findings and conclusions of OpenNet Initiative (ONI) research into each of the countries. The summaries also provide a basic framework for considering the factors influencing countries’ decision to filter or abstain from filtering the Internet, as well as the impact, relevance, and efficacy of technical filtering in a broader context of Internet censorship.

These summaries cover the countries where ONI conducted both testing and analysis in 2006. Countries selected for in-depth analysis are those in which it was believed that there was the most to learn about the extent and processes of Internet filtering. Many countries known to filter the Internet, including many in Europe and North America, were not subject to testing because their practices are well documented elsewhere. ONI plans to conduct in-depth analysis on an expanded number of countries in future years."

Link to online database of reports