In the lost media community there is a distinction between things that are known to be lost forever (baring some miracle) and things that may still exist but either no known copies have been found or the owner refuses to release a digital copy (usually due to copyright reasons). For example most of the early seasons of Doctor Who were lost due to the BBCs policy but over the years copies of the film and even some rudimentary at home recordings have been found, allowing for them to be archived and preserved