China's tyranny has the best hi-tech help
"Chinese searching the Internet for key, or "black" words are likely to be arrested, tried and imprisoned for up to 10 years on charges of subversion, revealing state secrets or spreading propaganda injurious to the state. They meet a similar fate if they use "black" words in something they post on the Internet, especially for foreigners to read."
Helping the Chinese regime to survey their own population include the following...
"Google, Microsoft, Yahoo, Cisco, Sun Microsystems and Skype. Each has its expertise. Google removes from its Chinese site whatever the Chinese deem politically sensitive. According to Reporters without Frontiers, "Cisco Systems has sold several thousand routers to enable the regime to build an online spying system and the firm's engineers have helped set it to spot 'subversive' key-words in messages."