The U.S. copyright of the film was not renewed after its first term expired in 1968, although because it is a derivative work from a play that is still under U.S. copyright, it cannot be said to be in the public domain.
The U.S. copyright of the film was not renewed. Its first term expired in 1968. It cannot be said to be in the public domain. It is a derivative work from a play. This play is still under U.S. copyright.