Copyrights Again

I have learned that if you take someones copyrighted work and call it your own, you can be sued for thousands of dollars. It can also work the other way as well. If you create something and do not copyright it, other people can then take that and make bank off of it. In a studio I know that there is a director, a filmer, and an audio guy, that is about all i could tell you about possisions in a film studio.