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to remix – to adapt the work
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https://creativecommons.org/licenses/by/4.0CC BY 4.0 Creative Commons Attribution 4.0 truetrue
Mask: Per the United States Copyright Office, exhibition of artwork constitutes publication for the purposes of copyright. This was exhibited in 1935, and searches for copyright registrations in 1932–1935 as well as for renewals in 1960–1963 did not find any results for the artist.
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 (50 p.m.a.), Mainland China (50 p.m.a., not Hong Kong or Macao), Germany (70 p.m.a.), Mexico (100 p.m.a.), Switzerland (70 p.m.a.), and other countries with individual treaties.