Will Gompertz blog: Selma, Sony and censorship

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 told the BBC that a film about freedom of speech has never been more timely.

The BBC's arts editor Will Gompertz reflects on why.