- Censorship and Free Speech
- The Privatization of Censorship
- Anonymity
- Eliminating online censorship: Freenet, Free Haven and Publius
- Censored links: Linking as a crime
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Roman smoke telegraph network, 150 A.D.
The Roman smoke signals network consisted of towers within visible range of each other and had a total length of about 4500 kilometers. It was used for military signaling.
For a similar telegraph network in ancient Greece see  Aeneas Tacitus' optical communication system.
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