I think I have a great idea for good action movie (like SPIDERMAN) but I live in Brazil, far away from L.A’s big movie industry. Who could I trust to share this excellent idea with without being cheated? Can I register an idea of a screenplay before I tell anyone?
You can register written material that isn’t in screenplay form, both with the WGA and through normal means of copyright (which may work differently in Brazil). If you’re worried about someone stealing your idea, you could write up a fairly detailed version of it in prose form and register it though one or both of these means. That’s plenty of protection.