Films may not be completed for several reasons, with some being shelved during different stages of the production. Some films have been shut down days into production. Other unfinished films have been shot in their entirety but have not completed post-production where the film is edited and sound and score added. Unfinished films are distinguished from unreleased films which are finished but have not yet been released and shown in theatres or released on DVD. In some instances these films cannot be shown for legal reasons. Withdrawn films are similar except they did have brief showings but cannot be shown again, also usually for legal reasons.[citation needed]
According to the Film Yearbook, "history has shown that the unfinished film is with few exceptions designed to remain that way."[1] Exceptions do exist: these include Gulliver's Travels and The Jigsaw Man, both of which shut down when they ran out of funds but after a year or more found new financing and were able to finish shooting.[citation needed]