The implications of fair use in filmmaking are many. Fair use is a doctrine that allows for the unlicensed use of copyrighted materials under certain circumstances, such as for educational purposes, reporting, or scholarly work. 

In filmmaking specifically, fair use could allow for the limited unlicensed use of your work. For example: a teacher playing a film to her class, or a news outlet playing clips of a movie in a review of it. In the case of producing a film, fair use only truly comes into play in documentaries or other educational works.