Selection of films for preservation in the US Library of Congress
The National Film Registry (NFR) is the United States National Film Preservation Board's (NFPB) collection of films selected for preservation, each selected for its historical, cultural and aesthetic contributions since the NFPB's inception in 1988. History. Throughout the 1980s, several prominent filmmakers and industry personalities in the United States, such as Frank Capra and Martin Scorsese, advocated for Congress to enact a film preservation bill in order to avoid commercial modifications (such as pan and scan and editing for TV) of classic films, which they saw as negative.
https://en.wikipedia.org/wiki/National_Film_Registry