CHAIN OF TITLE
When you begin production you will need to ensure that the project you are putting together is owned completely by the company producing it. Another option is to have paperwork proof that the company has the rights to produce the project, if not directly owned. These documents are called, "Chain of Title".
In a nutshell, this paperwork tracks the ownership of the script, book, article or other basis for the project back to the originator. Through selling the intellectual property or allowing the sale of production rights for the production to commence - the project will legally be allowed to move forward.