Everything from Bibles to pro-democracy literature to thumb drives to transistor radios are launched.
The North Korean government is aware of them, and will shoot them down if they can, and arrest people caught with the materials. Since possession can carry the death penalty, it's not something people take lightly.
That idea seems idiotic.....not wisdom to cause an international incident. The North Korean Leader does not appear to me to be all that stable, and to set him off over a movie seems less than intelligent.