I have copyrighted material in my Dropbox right now. It's copyrighted by me and my business partners. We're making a film and the material on our dropbox will

I have copyrighted material in my Dropbox right now. It's copyrighted by me and my business partners. We're making a film and the material on our dropbox will eventually make it into the public eye. We're not Big Media people, but what about other content creators? Especially musical collaborators...