On Wed, Feb 28, 2007 at 08:51:32AM -0800, Michael_google gmail_Gersten wrote: [...] > "He that would make his own liberty secure, must guard even his enemy > from oppression". There are many reasons why I do not think it is a good idea to add any censorship code to Tor. That's one of them. Let me elaborate. Let's assume for the sake of argument that some kinds of expression are so totally pernicious and without merit that the world would be better if nobody could engage in them. (If you disagree, great, but bear with me here.) Even if this _were_ the case, would not follow that it is a good thing to create censorship mechanisms for that data. - First, since censorship tech requires people to administer it, creating censorship tech places some people in control of what other people can say and see. Even if the censors are enlightened minimalists who begin with the best of intentions, the risk is high that they will err, or be subverted, or be replaced. Centralizing authority like this creates a nasty point of failure, and a tempting target for attackers. (Before somebody proposes that a legal system be given the job of deciding what's okay, I'd point out that what's banned in France != what's banned in China != what's banned in the US[*] != what's banned in Russia != what's banned in Iran. If you ban only the intersection of illegal things, you ban nothing. If you ban the union of illegal things, you do the censors' job for them.) - Second, there's Paul's point above about legal ramifications under US law. - Third, censorship tech has unintended consequences. Check out Richard Clayton's paper "Failures in a Hybrid Content Blocking System." Clayton describes how BT, in an attempt to create a highly specific content blocking system, in effect wound up creating an index service for the very content they were trying to block. This problem would only be _worse_ in a system like Tor where, if you wanted to block access to certain places, you would necessarily need to give exit nodes access to the blacklist. Remember, it is possible to believe in right and wrong without believing that moral judgments belong in the OSI stack. Also, this should not need to be said, but debates about the merits of Divine Command Theory[**] are not on-topic here. Remember, just as two wrongs don't make a right, an off-topic post is not sufficient to make a reply on-topic. [*] And don't get me started on obscenity law in the US: distributing "obscene" materials is generally illegal, but "obscenity" is defined in reference to prevailing community standards. In general, there's no way to be quite sure whether something will be found obscene other than going to court over it, and there's no guarantee that what's found not to be obscene here will be found obscene 50 miles away. [**] http://en.wikipedia.org/wiki/Divine_command_theory . I've got strong opinions about _this_ too, but I also have the good sense, I hope, to keep my mouth shut about it on the mailing list. ;) yrs, -- Nick Mathewson
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