License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Various artists. Model Calligraphies from the “Hall of Three Rarities” (Sanxitang) and the "Collected Treasures of the Stony Moat” (Shiqu Baoji), second half of 18th century. The Metropolitan Museum of Art.