Can any of you legal types out there explain to me how companies can trademark products based on works in the public domain? I've never understood that. For example, how do movie studios secure rights to all those different versions of Dracula? Don't they conflict with each other? They're all based on Bram Stoker's novel which is firmly in the public domain. Does the movie industry just conduct gentlemen's agreements amongst themselves that competing versions won't be released at the same time?