Had Copywrite law not been changed in 1978, works from 1955 would have entered the Public Domain. Given the rip and repost culture we have now, I wonder how these laws will hold up, even with something like SOPA:
The Seven Year Itch, The Lady and the Tramp, Rebel Without a Cause, Tutti Frutti, Lolita.
http://www.law.duke.edu/cspd/publicd.../2012/pre-1976