National Film Registry
The National Film Registry is meant to preserve up to 25 "culturally, historically or aesthetically significant films" each year; to be eligible, films must be at least 10 years old. The films do not have to be feature-length or to have had a theatrical release. The Foundation's primary mission is to save so-called "orphan films," films without owners to pay for their preservation. The films most at-risk are newsreels, silent films, experimental works, films out of copyright protection, significant amateur footage, documentaries, and features made outside the commercial mainstream. Some films made by now-defunct film studios have also been inducted. Hundreds of American museums, archives, libraries, universities, and historical societies care for "orphaned" original film materials of cultural value. As of 2004, there were 400 films preserved in the National Film Registry.