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 “Francesco Sforza (1401–1466), Fourth Duke of Milan (r. 1450–66)” — 62 records examined, 16 dropped by the rights gate.
Archives queried 2026-09-04 06:57 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Francesco Sforza (1401–1466), Fourth Duke of Milan (r. 1450–66)
Artist not stated in the record · late 15th century
Bouteloua gracilis (Kunth) Lag. ex Griffiths
Artist not stated in the record · Transcribed d/m/y: 9/9/2018
Study for the Equestrian Monument to Francesco Sforza
Antonio Pollaiuolo · early to mid 1480s
Woman with a Book
Artist not stated in the record · ca. 1760–1770
Francesco d'Este (born ca. 1429, died after 1486)
Rogier van der Weyden · ca. 1460
Woman with a Turban
Artist not stated in the record · ca. 1760–1770
Salome with the Head of Saint John the Baptist
Andrea Solario · ca. 1507–9
The Drawing Academy of Francesco Rosaspina
Artist not stated in the record · 1811
Francesco I Sforza 1401-66, Duke of Milan 1450-66
Gian Francesco Enzola · 1456
Piazza San Domenico in Bologna; Piazza San Francesco and Villa Aldini in Bologna; Study of Tomb of Glossatori
Felice Giani, Italian, 1758–1823 · 1811–14
The Birth of the Virgin
Fra Carnevale (Bartolomeo di Giovanni Corradini) · 1467
Francesco Mazzolini
Artist not stated in the record · c. 1860-70
Virgin and Child
Dieric Bouts · ca. 1455–60
Francesco Mazzolini
Artist not stated in the record · c. 1860-70
Campo Santa Maria Zobenigo, Venice
Canaletto (Giovanni Antonio Canal) · 1730s
Francesco Mazzolini
Artist not stated in the record · c. 1860-70
The Adoration of the Magi
Joos van Wassenhove · 1472–74
Francesco Mazzolini
Artist not stated in the record · c. 1860-70
Saint Matthew and the Angel
Giovanni Gerolamo Savoldo
Francesco Mazzolini
Artist not stated in the record · c. 1860-70
Portrait of a Young Man
Cosmè Tura (Cosimo di Domenico di Bonaventura) · 1470s
Francesco Mazzolini
Artist not stated in the record · c. 1860-70
The Grand Canal, Venice, Looking Southeast, with the Campo della Carità to the Right
Canaletto (Giovanni Antonio Canal) · 1730s
Francesco Mazzolini
Artist not stated in the record · c. 1860-70
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. 22 matched · 22 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. 447 matched · 40 examined · 16 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 2026-09-04 06:57 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.