u/ThrowAwayBurner188

I am posting this from a throwaway account to keep myself anonymous. Long story short, my father was the assistant to Uwe Brander who did the music for Herzog's short film Game in the Sand which we all know has never been released. I have come across a hard drive that contains 12 of the 14 minutes of the film. I have personally watched it and while I won't get into details, there are very good reasons why this short film was never released. I want to make it clear that my father did NOT receive this copy from Mr. Brander. He sat on this for many years and I only received it recently after my father passed away. My question is this: would I face any legal consequences if I were to release this film online?