Well, I feel for any form of censorship, the essence is to disrupt the communication among the people in the society. The goal of this disruption is to prevent

Well, I feel for any form of censorship, the essence is to disrupt the communication among the people in the society. The goal of this disruption is to prevent a formation of synchronization in the population. It could be carried out on all kinds of communication media and for all their different stages. A system of censorship could be much easily implemented when one has the visibility over the entire society and the access to all its social resources. Before the age of internet, their focus was on book/newspaper publishing; and in our current age of internet, the focus was on internet as well as book/newspaper publishing. And in terms of their practical methods, you can just imagine what you would do when you want to disrupt the information flow and when you have the absolute control of every sub-system in a society (i.e. the courts, the police, all the newspapers/websites/tv channels/radio stations, as well as the ability of not needing to worry about your livelihood when you do not work on anything else...) It's almost an impregnable castle, as long as it does not crumble from inside the ruling system itself...