The Perlinger Archives, located on the Internet Archive on archive.org, and founded by Rick Prelinger, contains many different types of films in topics ranging from advertising, educational, and even wartime films. According to the website, their goal is “to collect preserve, and facilitate access to films of historic significance that haven’t been collected elsewhere.” Regarding the copyright, which you can find here, the website makes a point to ensure the audience understands what can be copied or downloaded. The website tells the audience that, there is Public Domain material within the collection with a Creative Commons license for it.