Public Domain - Free items for use.

Using copyrighted media can be bad. If you don't know what "public domain" is reffering to, it's media with expired copyrights. This is the general link to the site, archive.org. In it you can find music, moving images of all kinds and even books.

There are hundreds of thousands of pieces of media to download on this site. Check out the Prelinger Archives--a great (if not the best) source of old newsreels and Ephemeral Films (stuff like "Duck and Cover" and "Are You Popular?") And they're all free. There are even features like "The Cabinet of Dr. Caligari" and "Night of the Living Dead." You don't need to sign up, there's no password.