Licensing & reuse
Every work here is indexed because its holding institution cleared it for reuse. The specific terms still differ, and they are shown on each page.
CC0
No rights reserved. Use commercially, modify, redistribute. No permission or credit required.
Public domain
Copyright has expired or never applied. Same freedoms in practice.
CC BY 4.0
Free to use commercially provided you credit the source. The required credit line is printed on the artwork's page; copy it exactly.
One caveat worth reading
A licence covers the image, not everything depicted in it. Trademarks, identifiable people and separately-copyrighted works inside a photograph can carry their own restrictions. For anything commercially significant, confirm on the museum's own page. Every artwork here links back to it.