Narrowly
defined, it's a motion picture abandoned by its owner. More generally,
an orphan is any work that has been neglected. The term refers
to all manner of films outside of the commercial mainstream: public
domain materials, home movies, outtakes, unreleased films, industrial
and educational movies, independent documentaries, ethnographic
films, newsreels, censored material, underground works, experimental
pieces, silent-era productions, stock footage, found footage,
medical films, kinescopes, small-gauge films, amateur productions,
surveillance footage, test reels, government films, advertisements,
sponsored films, student works, and sundry other ephemeral pieces
of celluloid.
For
examples, visit the National
Film Preservation Foundation, an institution dedicated to
saving orphan films.