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 “Charles Mathieu” — 64 records examined, 42 dropped by the rights gate.
Archives queried 2026-09-03 16:13 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term..jpg&w=3840&q=75)
Sopranino Clarinet in G
Charles Mathieu · ca. 1890
Desmatodon obtusifolius (Schwägr.) Mathieu
Artist not stated in the record
Design for a Section of a Domed Corinthian Temple
Pierre Mathieu · 1769
Desmatodon obtusifolius (Schwägr.) Mathieu
Artist not stated in the record
Project for the Monument de la Montagne, Orléans
Claude Mathieu Delagardette · ca. 1794
Peperomia cavispicata G. Mathieu
Artist not stated in the record · 10 Jul 1940
Project for the Monument de la Montagne, Orléans
Claude Mathieu Delagardette · ca. 1794
Desmatodon obtusifolius (Schwägr.) Mathieu
Artist not stated in the record · 2 May 1958
Un Coup de Vent non Prédit par Mathieu (de la Drôme), plate 1 from "Croquis d'Hiver"
Honoré Daumier · December 3, 1864
Goeppertia varians (K. Koch & L. Mathieu) Borchs. & S. Suárez
Artist not stated in the record · 30 Sep 1959
The Card Players
Paul Cézanne · 1890–92
Desk
Mathieu-Guillaume Cramer · ca. 1780
Vase with cover (vase urne antique)
Sèvres Manufactory · ca. 1755–57
Pope Benedict XIV (Prospero Lambertini, 1675–1758)
Pierre Hubert Subleyras · 1746
Saint Cecilia
Gustave Moreau · ca. 1890–95
Charles-Louis de Secondat (1689–1755), baron de La Brède et de Montesquieu
Sèvres Manufactory · ca. 1784
Oedipus and the Sphinx
Gustave Moreau · 1864
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. 34 matched · 24 examined · 7 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.12 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 127860 matched · 40 examined · 35 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.5 shown
These figures describe the pass run at 2026-09-03 16:13 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.