https://archive.org/details/prelinger

Location of “Rights” Statement is on the About page https://archive.org/details/prelinger&tab=about  Scroll halfway down to RIGHTS
The Prelinger Archives is a collection of films: ephemeral” (advertising, educational, industrial, and amateur) films. In 2002, the film collection was acquired by the Library of Congress, Motion Picture, Broadcasting and Recorded Sound Division. Prelinger Archives remains in existence within the  Internet Archive. Its goal remains to collect, preserve, and facilitate access to films of historic significance that haven’t been collected elsewhere. Included are films produced by and for many hundreds of important US corporations, nonprofit organizations, trade associations, community and interest groups, and educational institutions.

Films Searchable by Title, Date Published, Creator