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CowboyRobot writes "The ACM has an article describing the history and present of the Great Firewall of China (GFW). "Essentially, GFW is a government-controlled attacking system, launching attacks that interfere with legitimate communications and affecting many more victims than malicious actors. Using special techniques, it successfully blocks the majority of Chinese Internet users from accessing most of the Web sites or information that the government doesn't like. GFW is not perfect, however. Some Chinese technical professionals can bypass it with a variety of methods and/or tools. An arms race between censorship and circumvention has been going on for years, and GFW has caused collateral damage along the way."" Link to Original Source
Any sufficiently advanced technology is indistinguishable from a rigged demo.