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. 24 shown for “Gruber, Martin A” — 64 records examined, 9 dropped by the rights gate.
Archives queried 2026-09-02 08:58 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Combination table
Martin Carlin · ca. 1775
Statue of Martin Luther
Gruber, Martin A · 1919
Approaching Thunder Storm
Martin Johnson Heade · 1859
Trees in Washington, DC
Gruber, Martin A · 1919
Young Husband: First Marketing
Lilly Martin Spencer · 1854
Unidentified Washington, DC Church
Gruber, Martin A · 1919
Secretary
Martin Carlin · ca. 1781–85
Trees in Washington, DC
Gruber, Martin A · 1919
Altar Predella and Socle of Archbishop Don Dalmau de Mur y Cervelló
Francí Gomar · ca. 1456–1458
Q Street Bridge
Gruber, Martin A · 1919
Bust of a Man in a Hat Gazing Upward
Martin Schongauer · ca. 1480–90
Boulder Bridge
Gruber, Martin A · 1919
Mantel clock
Martin · mid-18th century
Trees in Washington, DC
Gruber, Martin A · 1919
Saint Martin
Artist not stated in the record · 1340–50
Trees in Washington, DC
Gruber, Martin A · 1919
Seasons and Elements (Fire) (set of four)
Charles Le Brun · ca. 1683
Trees in Washington, DC
Gruber, Martin A · 1919
Seasons and Elements (Spring) (set of four)
Charles Le Brun · ca. 1683
Chain Bridge
Gruber, Martin A · 1919
Seasons and Elements (Summer) (set of four)
Charles Le Brun · ca. 1683
Trees in Washington, DC
Gruber, Martin A · 1919
Martin Folkes (1690–1754)
Jacques-Antoine Dassier · 1740
Trees in Washington, DC
Gruber, Martin A · 1919
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. 4240 matched · 24 examined · 9 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. 1792200 matched · 40 examined · 0 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 08:58 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.