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 “Jacob Backer” — 55 records examined, 34 dropped by the rights gate.
Archives queried 2026-08-27 01:09 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Weeping Woman Kneeling, Seen from Behind
Jacob Backer · ca. 1634–38
Teyleria koordersii (Backer) Backer
Artist not stated in the record · 18 Dec 1933
Portrait of a Man
Jacob Backer · ca. 1645–50
Digitaria eminens (Steud.) Backer
Artist not stated in the record · 19 Apr 1920
Isaac Blessing Jacob
Gerbrand van den Eeckhout · 1642
Digitaria eminens (Steud.) Backer
Artist not stated in the record
Old Woman in an Armchair
Jacob Backer
Digitaria eminens (Steud.) Backer
Artist not stated in the record · Aug 1889
The Adoration of the Holy Trinity in the New Covenant
Friedrich Sustris · 1588 or before
Indigofera guatemalensis Moc. et al. ex Backer
Artist not stated in the record · 1 Nov 1938
Portrait of an Old Woman
Jacob Backer
Anadendrum microstachyum (de Vriese & Miq.) Backer & Alderw.
Artist not stated in the record
Virgin and Child, and Saint John the Baptist (recto); Summary sketches, possibly the Virgin and Child (verso)
Jacob de Backer · ca. 1580–90
Petronella Elias (1648–1667) with a Basket of Fruit
Ferdinand Bol · 1657
Portrait of a Woman, probably a Member of the Van Beresteyn Family
Rembrandt (Rembrandt van Rijn) · 1632
Portrait of a Man, probably a Member of the Van Beresteyn Family
Rembrandt (Rembrandt van Rijn) · 1632
Portrait of a Woman
Jürgen Ovens · 1650
The Jabach Family
Charles Le Brun · ca. 1660
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. 15 matched · 15 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. 17998 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 2026-08-27 01:09 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.