Paramount have put 100+ older films on to YouTube - you need to be in the USA to access them, but that's the only limitation.

http://www.openculture.com/2015/10/stream-100-free-movies-from-paramount-pictures-on-youtube.html

Some interesting films are mentioned in the article, since I can't access them I haven't checked the whole list.

Marcus L. Rowland
Forgotten Futures, The Scientific Romance Role Playing Game