No. Basically, broadcasters only have to inform television viewers about the content of a movie they are about to watch. As I indicated in my opening remarks, there is no obligation, but usually when you watch a movie, an icon showing that the movie was rated appears at the start of the film. Very often, that icon is shown several times throughout the broadcast. Nothing prevents a broadcaster from airing a film rated “13 years and over with violence.”
On March 4th, 2008. See this statement in context.