"Rick Prelinger and The Internet
Archive hereby offer these public domain films from Prelinger Archives
to all for free downloading and reuse. You are warmly encouraged
to download, use and reproduce these films in whole or in part,
in any medium or market throughout the world. You are also warmly
encouraged to share, exchange, redistribute, transfer and copy these
films, and especially encouraged to do so for free." So that's
OK, then. Have look. Use them.