That's fine with me. He wouldn't have the rights to reproduce my book itself, nor to use my plots or characters in other mediums, so why would I give a toss? Even if the film was complete shite (which it most likely would be), people who aren't idiots would know that he made it, not me. Not only would I become a household name overnight, I'd stand to make tens of millions of dollars just by signing my name. Then I'd be free to go back to doing whatever I was doing before, only much more comfortably. Not to mention that upon the release of my next book, everyone would be wondering "What's he up to now?", and I'd likely make a killing on that one too. So long as there's nothing in the wording that stipulates I'm obligated to do publicity for the film, I'd be fine with it.