Context of Citizenfour., Radius presents a Praxis Films production ; in association with Participant Media ; in association with HBO Documentary Films ; in co-production with Bertha Foundation, Britdoc Circle, Channel 4 ; in co-production with Norddeutscher Rundfunk NBR, Bayerischer Rundfunk BR ; producers, Laura Poitras, Mathilde Bonnefoy ; produced by Dirk Wilutzky ; directed by Laura Poitras


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