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:

	The author died in 1510, so 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/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.
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I, the copyright holder of this work, release this work into the public domain. This applies worldwide. In some countries this may not be, legally possible; if so: I grant anyone the right to use this work for any purpose, without any conditions, unless such conditions are required by law.

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."