As a journalist, Laura Poitras was the quiet mastermind behind the publication of Edward Snowden
In the closing credits of Citizenfour, Poitras took the unusual step of adding an acknowledgment of the free software projects that made the film possible: The roll call includes anonymity software Tor, the Tor-based operating system Tails, GPG encryption, Off-The-Record (OTR) encrypted instant messaging, hard disk encryption software Truecrypt, and Linux. All of that describes a technical setup that goes well beyond the precautions taken by most national security reporters, not to mention documentary filmmakers.

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