Can you explain how? Do they stop people from trying to tell Cinderella stories, or is it only their own exclusive work that is affected?
I'm not sure what I think about this law. I don't know that I, in particular, need to be able to use someone else's narrow creation (Mickey Mouse, Sherlock Holmes, etc.) 50, 100, or 200 (well past when I think whatever law the US has in effect today will matter) years from when the creator invented them. Why am I not creating my own inventive work. To me, what's important would more be the scope of what someone can claim as theirs (can Disney come after me for my own anthropomorphic mouse character, Fred), which this doesn't seem to address at all.