Media playback is unsupported on your device Media caption Can Martin Luther King save Hollywood from censorship, asks Will Gompertz

The FBI says North Korea was behind a cyber-attack on Sony Pictures, over a film about its leader Kim Jong-un.

Sony withdrew The Interview following threats from hackers against US cinemagoers. North Korea denies any involvement.

Now, the lead actor in Martin Luther King biopic Selma, has said that a film about freedom of speech has never been more timely.