I am a film historian. I would like to add some titles of "forgotten" films. For example: I have data about several short documentary and fiction films that were made and screened in Belgium around 1940-1945. These were not feature films. No prints have survived. There was no international release. So a lot of the data you are required to fill in when entering a new title are just not available. But these films have existed. (I can produce evidence, like newspaper articles.) So how can I enter this information?