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. 18 shown for “Diptych with the Nativity and the Mass of Saint Gregory” — 64 records examined, 34 dropped by the rights gate.
Archives queried 2026-09-05 21:44 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Diptych with the Nativity and the Mass of Saint Gregory
Artist not stated in the record · early 16th century
The Mass of St. Gregory
Artist not stated in the record · 1511
The Crucifixion with the Virgin and Saint John
Hendrick ter Brugghen · ca. 1624–25
Saint Basil and Saint Gregory
Artist not stated in the record · 1665-1700
Diptych with Scenes of the Annunciation, Nativity, Crucifixion, and Resurrection
Artist not stated in the record · 1300–1325
Icon
Ethiopian Orthodox · 15th-16th century
The Nativity
Lorenzo Monaco (Piero di Giovanni) · ca. 1406–10
Icon
Ethiopian Orthodox · ca. 1630-1700
The Belles Heures of Jean de France, duc de Berry
The Limbourg Brothers · 1405–1408/1409
Gregory, Illustration for Harper's New Monthly Magazine (LXVIII, No. CCCCIII, December 1883, p. 17)
Frederick Stuart Church, American, 1842–1924 · December 1883
The Fieschi Morgan Staurotheke
Artist not stated in the record · early 9th century
Irish Brooch, 1800s
Artist not stated in the record · 1840-1870
The Crucifixion
Master of the Codex of Saint George · ca. 1330–35
The Crucifixion; The Last Judgment
Jan van Eyck · ca. 1436–38
Madonna and Child Enthroned with Two Angels
Fra Filippo Lippi · ca. 1440
View of Haarlem and the Haarlemmer Meer
Jan van Goyen · 1646
The Death of the Virgin (The Dormition)
Tilman Heysacker · late 15th century
Saint Michael; The Mass of Saint Gregory; Saint Jerome
Master of the Saint Catherine Legend
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. 1120 matched · 24 examined · 0 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. 3245166 matched · 40 examined · 34 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.6 shown
These figures describe the pass run at 2026-09-05 21:44 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.