4. Censorship and freedom
Everyone values their freedom, in fact, many consider it so important that they will die for it. People like to think that they are free to form and hold whatever opinions they like, particularly in western countries. Consider now that someone had the ability to control the information you have access to. This would give them the ability to manipulate your opinions by hiding some facts from you, by presenting you with lies and censoring anything that contradicted those lies. This is not some Orwellian fiction, it is standard practice for most western governments to lie to their populations, so much so, that people now take it for granted, despite the fact that this undermines the very democratic principles which justify the government's existence in the first place.
5. The solution
The only way to ensure that a democracy will remain effective is to ensure that the government cannot control its population's ability to share information, to communicate. So long as everything we see and hear is filtered, we are not truly free. Freenet's aim is to allow two or more people who wish to share information, to do so.
6. Isn't censorship sometimes necessary?
Of course no issue is black and white, and there are many who feel that censorship is a good thing in some circumstances. For example, in some European countries propagating information deemed to be racist is illegal. Governments seek to prevent people from advocating ideas which are deemed damaging to society. There are two answers to this however. The first is that you can't allow those in power to impose "good" censorship, without also enabling them to impose "bad" censorship. To impose any form of censorship a government must have the ability to monitor and thus restrict communication. There are already criticisms that the anti-racism censorship in many European countries is hampering legitimate historical analysis of events such as the second world war.
The second argument is that this "good" censorship is counter-productive even when it does not leak into other areas. For example, it is generally more effective when trying to persuade someone of something to present them with the arguments against it, and then answer those arguments. Unfortunately, preventing people from being aware of the often sophisticated arguments used by racists, makes them vulnerable to those arguments when they do eventually encounter them.
Of course the first argument is the stronger one, and would still hold-true even if you didn't accept the second. Basically, you either have censorship, or you don't. There is no middle-ground.
source:
http://freenetproject.org/philosophy.html