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. 14 shown for “Adolphe Pierre Riffaut” — 64 records examined, 38 dropped by the rights gate.
Archives queried 2026-09-02 22:51 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Mary, Queen of Scots
Adolphe Pierre Riffaut · 1828
Pentace borneensis Pierre
Artist not stated in the record · Oct 1922 to Mar 1923
Salvator Rosa among the Brigands
Adolphe Pierre Riffaut · after 1844
Garcinia dives Pierre
Artist not stated in the record · Mar 1907
Euonymus cochinchinensis Pierre
Artist not stated in the record · May 1904
Garcinia benthamii Pierre
Artist not stated in the record · Feb 1911
Garcinia dives Pierre
Artist not stated in the record · Apr 1910
Garcinia tetrandra Pierre
Artist not stated in the record · Dec 1915
Garcinia tetrandra Pierre
Artist not stated in the record · Jul 1909
Sarcostigma paniculata Pierre
Artist not stated in the record · Sep 1912
Palaquium dasyphyllum Pierre ex Dubard
Artist not stated in the record · Oct 1922 to Mar 1923
Payena acuminata (Blume) Pierre
Artist not stated in the record · Oct 1922 to Mar 1923
Cuphea utriculosa Koehne
Artist not stated in the record · Jan 1894
Cuphea utriculosa Koehne
Artist not stated in the record · 4 Jan 1893
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. 163 matched · 24 examined · 22 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.2 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 34684 matched · 40 examined · 16 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 2026-09-02 22:51 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.