An unauthorized production of Bram Stoker's work (The legal heirs didn't
give
their permission), so the names had to be changed. But this wasn't enough:
The widow of Bram Stoker won two lawsuits (1924 and 1929) in which she
demanded the destruction of all copies of the movie, however happily copies
of it were already too widespread to destroy them all. Later, the Universal
studios could break her resistance against this movie. Count Orlok's move to
Wisburg (Obviously the real "Wismar") brings the plague traceable to his
dealings with the Realtor Thomas Hutter, and the Count's obsession with
Hutter's wife, Ellen the only one with the power to end the evil.