The Motion Picture Association of America, which, among other things, issues age appropriateness ratings for every film released widely on American screens, operates with a level of secrecy generally reserved for international espionage organizations. A new documentary attempts to blow the lid off what the filmmakers see as an irresponsible and arbitrary process through which serious films are made or broken by their ratings. “The board’s members seem to have it in for independent films and hold scenes of sex, especially gay sex, to far more stringent standards than they do acts of violence.”