Tails is a 

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 that you can start on almost any computer from a USB stick or a DVD.

It aims at preserving your privacy and anonymity, and helps you to:

  • use the Internet anonymously and circumvent censorship;
    all connections to the Internet are forced to go through 
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    ;
  • leave no trace on the computer you are using unless you ask it explicitly;
  • use state-of-the-art cryptographic tools to encrypt your files, emails and instant messaging.