You will retain full copyright (assuming you have complete ownership of the copyright.) My role is that of adviser, I make no claim to your work. It's all yours baby.
I do require a simple release form.
One day a student came to class and asked, "Mr. Hewitt, somebody told me that most screenplays do not sell. Is that true?" I replied that is the case. And she said, "Well, what the hell are we doing here then?"
I will do my best to share my knowledge and guide you to write the best screenplay you can write but there are no guarantees.