"In live action video or photography, this argument does not apply because they cannot argue that you are duplicating a logo as real life is not a duplication." I don't understand that at all. A photograph bears the same relation to its subject as a render does. Incidentally, I seem to recall that the Tolkien estate claimed/claims the rights on all uses of the word "hobbit" on the grounds that the word was invented by JRRT (it wasn't). So you may be on safe ground with an orc (clearly a standard English word) but not with a nazgul (an invention - unless it is actually a Farsi word, I don't know).