Encounter back, to the future, electronic online educational resource

What do these have in common? Close Encounters of the Third Kind (an intelligent film in which a five-tone musical motif used for communication with aliens has become as quotable as any line of movie dialogue); Back to the Future (tells the tale of an accidental time-tourist who is stranded in the year 1955 and must find a way home as well as repair the space/time continuum and save his family from being erased from existence).

This December they were saved, in this electronic online educational resource, for the future. Even as many fill theatres to see new releases, few are aware that many films produced before 1950 (and the vast majority made before 1920) are lost forever. More info here and here.