FuDomain privacy is not very effective protection for criminals - it does not protect against the magic of the search warrant. It may slow down a private citizen who is trying to track a spammer, and blind press inquiries by preventing easy access to the identification of what company registered the domain name, but that information can be falsified anyway. The domain registration details are frequently irrelevant in a criminal investigation because it is more telling who is paying for the server space where the crime was committed, and for that you need a search warrant anyway.

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The best way to learn anything, is to question everything.