An orphan work is a copyright protected work for which rightsholders are positively indeterminate or uncontactable. Sometimes the names of the originators or rightsholders are known, yet it is impossible to contact them because additional details cannot be found. A work can become orphaned through rightsholders being unaware of their , or by their demise (e.g. deceased persons or defunct companies) and establishing inheritance has proved impracticable. In other cases, comprehensively diligent research fails to determine any authors, creators or originators for a work.
Precise figures of orphan works are not readily available, even though libraries, archives and museums hold a vast number of them. In April 2009, a study estimated that the collections of public sector organisations in the UK hold about 25 million orphan works. Examples of orphan works include photographs that do not note the photographer, such as photos from scientific expeditions and historical images, old folk music recordings, little known novels and other literature.Software which became an orphaned work is usually known as Abandonware. The Computerspielemuseum Berlin estimates that around 50 % of their video game collection consists of at least partial orphans.
In countries whose laws do not specifically allow for the use of orphan works, orphan works are not available for legal use by filmmakers, archivists, writers, musicians, and broadcasters. Because rightsholders cannot be identified and located in order to obtain permission, historical and cultural records such as period film footage, photographs, and sound recordings cannot be legally incorporated in contemporary works in such countries (unless the incorporation qualifies as fair use).Public libraries, educational institutions and museums, who digitise old manuscripts, books, sound recordings and film, may choose to not digitise orphan works, or make orphan works available to the public, for fear that a re-appearing rightsholder may sue them for damages.
According to Neil Netanel the increase in orphan works is the result of two factors: (1) that copyright terms have been lengthened, and (2) that copyright is automatically conferred without registration or renewal. Currently only a fraction of old copyrighted works is available to the public. Netanel argues that rightsholders have "no incentive to maintain a work in circulation" or otherwise make their out-of-print content available unless they can hope to earn more money doing so than by producing new works or engaging in more lucrative activities.