This Master thesis deals with the subject of state censorship of the Internet. The objective of the thesis is to map the techniques of state censorship of the Internet and the methods of circumvention. In the first part, the author introduces organisations and projects that investigate state Internet censorship in the world. Subsequently, the author depicts inspection methods of communication and the Internet filtering techniques. The following part focuses on the principles of circumventing Internet censorship. It also describes various techniques of the circumvention of the censorship. Another objective of the thesis is to test the practical methods of circumventing Internet censorship. As a destination for the measurement the author has chosen PRC where he scrutinised the state of Internet censorship and tested the success rate of circumvention methods. The presented outputs serve as an overview of the techniques of the state censorship of the Internet and the methods of its circumvention, and can be used as a foundation for further work.

西元2010年Google不滿中國對於網際網路之審查規範，因而宣布退出中國網際網路搜尋引擎市場之營運，Google認為中國網際網路之審查規範已影響自由貿易，並於同年（2010年）發表白皮書，強調政府管制網路資訊的行為會影響貿易，於附件中討論WTO服務貿易總協定應如何適用於政府限制網路資訊之措施。Google冀望美國能將此爭議訴諸於世界貿易組織之爭端解決機構；而美國貿易代表署也受Google之呼籲，著手研究將中國網路審查措施，向世界貿易組織提出爭端案件之可能。 為了解本爭端若訴諸WTO爭端解決，美國勝訴之可能性，以及預測中國是否可能因Google案件而被迫調整其網路管制以符合WTO規範，本文討論重心將從WTO服務貿易總協定規範之角度探討Google所指摘之中國對於網際網路搜尋引擎服務之管制。