OpenTwo archives, queried live.
Every record below comes from The Met or Smithsonian Open Access and was filtered on that archive’s own rights field before it reached this page. 17 shown for “Tang Yifen” — 46 records examined, 22 dropped by the rights gate.
Archives queried 2026-08-29 03:30 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Landscape
Tang Yifen · dated 1845
Heterosmilax septemnervia F.T. Wang & Tang
Artist not stated in the record · 5 Aug 1937 to 23 Aug 1937
Blossoming Plum
Tang Yifen · Dated 1840
Ilex chingiana Hu & Tang
Artist not stated in the record · 14 Jun 1928
Landscape
Tang Yifen
Polygonatum mengtzense Wang & Tang
Artist not stated in the record
The Cassia Grove Studio
Wen Zhengming · ca. 1532
Diplodiscus trichospermus (Merr.) Y.C. Tang et al.
Artist not stated in the record · 1932 to 1933
Viewing the Moon in an Empty Room
Gu Luo · 1829
Diplodiscus trichospermus (Merr.) Y.C. Tang et al.
Artist not stated in the record · 17 Jul 1933
Ilex editicostata Hu & Tang
Artist not stated in the record
Heterosmilax seisuiensis (Hayata) F.T. Wang & Tang
Artist not stated in the record
Ilex editicostata Hu & Tang
Artist not stated in the record · 20 Oct 1931
Ilex hylonoma Hu & Tang
Artist not stated in the record · 8 Jul 1937 to 12 Jul 1937
Cremanthodium lineare Maxim.
Artist not stated in the record · 31 Jul 2009
Huodendron biaristatum subsp. parviflorum (Merr.) Y.C. Tang
Artist not stated in the record · 30 Apr 1995
Ilex editicostata Hu & Tang
Artist not stated in the record · 25 Jul 1924
Where these records came from.
Two archives are wired, and only two. Each one is filtered on its own rights field — never on a title match, and never on the presence of an image file.
- The Met Collection API (Open Access)Rights field:
isPublicDomain. 6 matched · 6 examined · 1 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.5 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 2865 matched · 40 examined · 21 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.12 shown
These figures describe the pass run at 2026-08-29 03:30 UTC, during this request. A completed pass is kept for 24 hours and replayed for an identical search, which is what keeps repeated queries inside Smithsonian’s 30-requests-per-hour allowance. A pass in which either archive failed to answer is never kept — an outage must not be replayed as though it were a finding about the catalogue.
Wikimedia Commons and the Library of Congress are deliberately not wired. Wikimedia was confirmed, on a live query, to return CC-BY material inside the same result set as genuine public domain works, and filtering it safely has not been designed yet. loc.gov was blocked by bot detection during the source evaluation, so its rights vocabulary has never been observed — and nothing here is built on a field nobody has read.
An image file is a rights claim. It never travels without its field.