Renewal searches were done in both film and artwork for the years 1956 and 1957. There were no listings for the film's title or for Paramount in regard to artwork renewals. There's no evidence of current copyright for the film or its related materials.
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.