Captain Kidd (1945) is a 1945 adventure film starring Charles Laughton, Randolph Scott, Barbara Britton, and John Carradine, directed by Rowland V. Lee, produced by Benedict Bogeaus and James Nasser, music conducted by Werner Janssen, and released by United Artists. The film has entered the public domain since the producers neglected to renew the copyright in 1972. The film was featured in an episode of Cinema Insomnia.
This work is in the public domain because it was published in the United States between 1923 and 1963 and although there may or may not have been a copyright notice, the copyright was not renewed.
Info & public domain status: https://en.wikipedia.org/wiki/Captain_Kidd_%28film%29