About the film
Unlocking the Cage is a 2016 American documentary film about the work of the Nonhuman Rights Project (NhRP) and lawyer Steven Wise's efforts to grant limited legal personhood rights to chimpanzees, whales, dolphins and elephants. It was directed by D. A.
Pennebaker and Chris Hegedus. It was the final film directed by Pennebaker before his death in August 2019.
From the film's Wikipedia article (CC BY-SA 4.0).