The Passive Voice takes on several things that belong in contracts today (and belonged in them yesterday, too, but back then agents tried to get these things for writers.) He also has a nice link to an older (May, 2011) post by Kristine Kathryn Rusch that is worth your time. (In fact, I can't think of a single business post I've ever read written by Kris Rusch that was not worth my time. FYI.)