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. 21 shown for “Pierre Mathieu” — 64 records examined, 34 dropped by the rights gate.
Archives queried 2026-09-03 18:26 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Design for a Section of a Domed Corinthian Temple
Pierre Mathieu · 1769
Album of Prints: Oeuvres diverses de Lalonde décorateur et dessinateur...1. Partie.
Richard de Lalonde, French, active 1780–96 · 1775-1788
The Mass of Saint Basil
Pierre Hubert Subleyras · 1746
Album of Prints: Different Works by LaLonde, Decorator and Designer, Part II, as well as works by Henri Sallembier
Richard de Lalonde, French, active 1780–96 · ca. 1780
Pope Benedict XIV (Prospero Lambertini, 1675–1758)
Pierre Hubert Subleyras · 1746
Album of Prints: Different Works by Lalonde, Decorator and Designer, Part II
Richard de Lalonde, French, active 1780–96 · 1775-1788
Head of a Bearded Man
Domenico Fetti · 1588/89–1623
Album of Prints: Different Works by LaLonde, Decorator and Designer, Part III
Richard de Lalonde, French, active 1780–96 · late 18th century
The Card Players
Paul Cézanne · 1890–92
Goeppertia varians (K. Koch & L. Mathieu) Borchs. & S. Suárez
Artist not stated in the record · 30 Sep 1959
The Adoration of the Shepherds
François Boucher
Goeppertia micans (L. Mathieu) Borchs. & S. Suárez
Artist not stated in the record · 6 Dec 2007
Supports for a stretcher from a console table
Jules Degoullons · probably late 19th–early 20th century
Tortula obtusifolia (Schwägr.) Mathieu
Artist not stated in the record
Peperomia tepoztecoana G. Mathieu
Artist not stated in the record · 6 May 1900
Charles-Louis de Secondat (1689–1755), baron de La Brède et de Montesquieu
Sèvres Manufactory · ca. 1784
Tortula obtusifolia (Schwägr.) Mathieu
Artist not stated in the record · 10 Nov 1952
Salome with the Head of John the Baptist
Gustave Moreau · ca. 1876
Tortula obtusifolia (Schwägr.) Mathieu
Artist not stated in the record · 8 May 1950
Oedipus and the Sphinx
Gustave Moreau · 1864
The Monet Family in Their Garden at Argenteuil
Edouard Manet · 1874
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. 24 matched · 24 examined · 4 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. 13732 matched · 40 examined · 30 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.10 shown
These figures describe the pass run at 2026-09-03 18:26 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.