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 “Master of Frankfurt” — 64 records examined, 38 dropped by the rights gate.
Archives queried 2026-08-27 00:54 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
The Adoration of the Christ Child
Master of Frankfurt · possibly 1496–1502
Felix Frankfurter
Oscar White, born 1921 · c. 1940
Low jug
Feulner · 17th century
Felix Frankfurter
Clara Sipprell, 31 Oct 1885 - 27 Dec 1975 · c. 1940
Lupona (royal seat)
Ngongo ya Chintu, formerly known as the "Buli Master" · ca. 1840–1870
Moses and Aaron before Pharaoh: An Allegory of the Dinteville Family
Master of the Dinteville Allegory · 1537
The Spiritual Master Padmasambhava
Artist not stated in the record · 14th century
Standing Cup and Cover Supported by an Enchained Turk
Artist not stated in the record · ca. 1705–11
The Visitation
Master Heinrich of Constance · ca. 1310–20
Saints Bartholomew and Simon
Master of Saint Francis · ca. 1272
The Virgin and Child in Majesty and the Adoration of the Magi
Master of Pedret · ca. 1100
Folding spoon
Johann Adam Boller · early 18th century
The Birth of Cupid
Master of Flora
The Adoration of the Christ Child
Jan Joest of Kalkar
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. 11523 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. 2859927 matched · 40 examined · 38 dropped by the rights gate. Kept only where metadata_usage.access === "CC0" and an image resource was published.2 shown
These figures describe the pass run at 2026-08-27 00:54 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.