[cheerfulcharlie]

I seem to recall that Monkhouse's "Mad Movies" informative show for children, introduced the forgotten silent movie stars (like Buster Keaton etc) to a new audience.These old silent films were considered worthless and copyright in the US had lapsed..However the new interest sparked by the likes of Monkhouse's shows was a double edged sword as these films left US 'public domain' and became under control and valuable again making it very difficult for Monkhouse to use them again without bother and a considerable ransom.Hence "Mad Movies" could probably not be shown again without entering a copyright minefield.