DescriptionDoorway tympanum - Oriental Institute Museum, University of Chicago - DSC06922.JPG
English: Oriental Institute Museum, University of Chicago, Chicago, Illinois, USA. Artwork is by Ulric Henry Ellerhusen (1879–1957), and was created in 1931. It is now in the public domain because it was published in the United States between 1923 and 1963, with its copyright not renewed.
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
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.