Own the rights?
Nothing except some jokes about rabbits multiplying.
Some bloody and gory scenes showing people messily ripped up. Other people and some animals are attacked by rabbits upclose and they often end up bloody.When the rabbits are shot, they often spout geysers of blood.
Very little.
Nothing.
Some scenes are kinda creepy and intense, but these are often diluted by the film's unintentionally funny content.