Edward Snowden receives the Sam Adams award for Intelligence Integrity in Moscow. Photo: Wikimedia

"I left knowing without a doubt that what [Snowden] did, he did because he believed it was the right thing to do. That he believed it would help the country he loves," said Gordon-Levitt.

"Now, as he would say, it's not for him to say whether it was right or wrong. That's really for people to decide on their own, and I would encourage anybody to decide that on their own. I don't want to be the actor guy who's like, 'You should listen to me! What he did was right!' I don't think that's my place. Even though that is what I believe — that what he did was right."

"Snowden" is based on Luke Hardin's book "The Snowden Files" and Anatoly Kucherena's "Time of the Octopus."

Along with Gordon-Levitt, the film stars Shailene Woodley as Lindsay Mills, Snowden's girlfriend, Zachary Quinto as Glenn Greenwald, and Melissa Leo as Laura Poitras. Greenwald was the journalist and Poitras the filmmaker Snowden leaked the classified documents to.

Nicolas Cage, Scott Eastwood, and Timothy Olyphant also star.

Gordon-Levitt will next been seen in the Robert Zemeckis film "The Walk," in which he'll be playing another real-life figure, Philippe Petit. The film recounts Petit's infamous tightrope walk across New York City's World Trade Towers in 1974.

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