Google's announcement in January that it was no longer willing to remove sensitive material from search results highlighted the issue of China's domestic internet controls.
But its decision last night to shift its Chinese-language service to servers in Hong Kong looks likely to put the spotlight on the methods Beijing uses to block content that is hosted overseas.
The censorship system works because it is twofold: it consists of controls on the content posted inside the country, and the "great firewall", which prevents mainland users from reading material hosted overseas.
While Google may have stopped censoring its results thanks to its move to Hong Kong, the Chinese government has not.
That is why, using google.com.hk from the mainland last night, searches for "Tiananmen student movement" in Chinese and "89 student movement" in English brought no results – just a message that is all too familiar to internet users in China: "The connection was reset."
<SNIP>
The great firewall is implemented by internet police in three ways. The first two are common tactics: blacklisting domain names and IP addresses, for example those belonging to groups such as Amnesty International. These methods are used by many countries around the world.
<SNIP>
The third technique used by China is "close to unique," added Murdoch. This is the keyword blocking system. Essentially, the government's system mirrors and searches each packet of data as it passes in and out of the country, looking in URLs and webpages for keywords such as "falun", in reference to the banned Falun Gong spiritual movement. Should it find them, it breaks the connection.
The result is that China is beginning to look like the world's biggest intranet, joke users. When Google announced it would not self-censor, the well-known blogger Hecaitou described it as "not an issue of Google abandoning China but one of China abandoning the world".
<SNIP>
http://www.guardian.co.uk/world/2010/mar/23/google-china-firewall-censorship-internet