Here's 3 examples of movies of Cultural Import * that are copyrighted and technically, probably shouldn't be there. But they're unavailable, or hard to find; possibly outlawed in some places.
I'm quite grateful to someone for taking the trouble to find, digitize, and upload these classics, and that archive.org can host them.
+ I'll leave it to you to figure out what the "cultural import" is in each case here. As with all Art, it's certainly debatable.
There's lots of other sources too.