In case the name didn't tip you off, PublicDomainTorrents.com is home to copyright-free movies—hundreds of them. The collection consists mainly of ancient black-and-white fare, which of course includes some great stuff.

A few clicks and you can be watching Fred Astaire's Royal Wedding, a reel's worth of Betty Boop shorts, and the camp classic Plan 9 From Outer Space.

Source:
http://www.pcmag.com/article2/0,1895,1912886,00.asp