This is a faithful photographic reproduction of an original two-dimensional work of art. The work of art itself is in the public domain for the following reason:

	This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 100 years or fewer. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

This digital reproduction has been released under the following licenses:

This is an image from the Yale University Art Gallery collections. According to the Yale University Art Gallery site, the depicted 2-dimensional work is believed to be the public domain, and the gallery's online photographs of such works are considered "open access materials", which "anyone may use … without further application, authorization, or fees due to the Gallery or to Yale." They specify "Photo credit: Yale University Art Gallery"; presumably this credit cannot be mandatory for a faithful reproduction of a two-dimensional work in the public domain, but would be courtesy.

In many jurisdictions, faithful reproductions of two-dimensional public domain works of art are not copyrightable. The Wikimedia Foundation's position is that these works are not copyrightable in the United States (see Commons:Reuse of PD-Art photographs). In these jurisdictions, this work is actually in the public domain and the requirements of the digital reproduction's license are not compulsory.