Note that it may still be copyrighted in jurisdictions that do not apply the rule of the shorter term for US works (depending on the date of the author's death), such as Canada (70 years p.m.a.), Mainland China (50 years p.m.a., not Hong Kong or Macao), Germany (70 years p.m.a.), Mexico (100 years p.m.a.), Switzerland (70 years p.m.a.), and other countries with individual treaties.
Spencer Tracy & Fredric March Screenshot from the trailer to Inherit the Wind. This screenshot is from a movie trailer in the public domain. licence : http://www.sabucat.com/?pg=copyright Trailer taken from: http://www.archive.org/details/inherit_the_w