H.P. Lovecraft invented the Cthulhu Mythos. You know, Shub-Niggurath, etc. Many writers have paid tribute to Lovecraft's creations. I'm wondering how this works - aren't they copyrighted? It's the same thing with Tolkien's inventions. If I wrote a story where I made a direct reference to, say, Cthulhu, would that be acceptable? I would love to have this cleared up. Thanks very much.