Who gets the royalties from propaganda films nowadays?

The thread on female directors brought up the subject of Triumph of the Will (obviously enough).

This lead me to wonder, if I were to buy the new special edition DVD release, who gets the money? Did/does Reifenstahl own the rights to her work? The same question goes for other works that are “dodgey”, for example Mein Kampf, Birth of a Nation etc.

There are various films and books that I would like to watch or read for their artistic merit, or historical value etc, but I do not wish to put cash in coffers that I do not approve of. If that makes sense…