English: The poster included a valid copyright notice, seen at bottom left. However, the copyright for the artwork was not renewed, as was required by American copyright law to extend/maintain protection for works published 1963 or earlier.
Searches on the Copyright Virtual Card Catalog and the US Copyright Public Records System (Beta) under the terms "Anchors Aweigh" "Loew's Inc." and "MGM" only feature renewals of the film and its songs between 1971 and 1972 with no evidence of any posters or promotional material being renewed. In order to maintain copyright protection, the poster would have had to be renewed 28 years after publication. Because it was not renewed, copyright lapsed at that time. Note that the poster art is a distinct work from the film it represents and had to be renewed separately.
Licensing
This is a faithful photographic reproduction of a two-dimensional,
public domain
work of art. The work of art itself is in the public domain for the following reason:
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.
The official position taken by the Wikimedia Foundation is that "faithful reproductions of two-dimensional public domain works of art are public domain". This photographic reproduction is therefore also considered to be in the public domain in the United States. In other jurisdictions, re-use of this content may be restricted; see Reuse of PD-Art photographs for details.
Uploaded a work by Loew's Incorporated from https://www.cineamo.com/en/movies/anchors-aweigh https://image.tmdb.org/t/p/original/Ia38xX5hamBovKd8lHZV9vS1rK.jpg with UploadWizard