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. 21 shown for “Otto Greiner” — 49 records examined, 21 dropped by the rights gate.
Archives queried 2026-09-09 02:47 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Even if the World is Full of Devils
Otto Greiner · ca. 1915
Rumohra adiantiformis (G. Forst.) Ching
Artist not stated in the record · Feb 1903
Sheet of studies for "Ex Libris Victor Graf von Rex"
Otto Greiner · 1900
Selasphorus rufus
Artist not stated in the record · 5 Dec 1987
Girl with Floral Wreath and Bouquet
Otto Greiner · 1912
Potentilla simplex Michx.
Artist not stated in the record · 7 May 1943
Exlibris “Sapienti Sat”
Otto Greiner · 1903
Oxytropis lambertii Pursh
Artist not stated in the record · 22 Jun 1896
Cover design for "Klassischer Skulpurenschatz"
Otto Greiner · late 19th century
John Vaughan (or Uriah)
Christopher Greiner, active 1837; died 1864 · ca. 1860
To Arthur Haferkorn
Otto Greiner · 1904
Alpagrostis alpina (Scop.) P.M. Peterson et al.
Artist not stated in the record · 12 Sep 1910
Cover design for "Klassischer Skulpurenschatz"
Otto Greiner · late 19th century
Alpagrostis alpina (Scop.) P.M. Peterson et al.
Artist not stated in the record · 12 Sep 1910
A male and a female figures (study for 'Golgotha')
Otto Greiner · late 19th–early 20th century
Senna hebecarpa (Fernald) H.S. Irwin & Barneby
Artist not stated in the record · 11 Jun 1943
Study of a Female Dancer
Otto Greiner · late 19th–early 20th century
Carex laxiculmis Schwein.
Artist not stated in the record · 4 Jun 1943
Carex leavenworthii Dewey
Artist not stated in the record · 3 Jun 1943
Viola pedata L.
Artist not stated in the record · 22 May 1943
Helianthus decapetalus L.
Artist not stated in the record · 25 Sep 1942
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. 9 matched · 9 examined · 0 dropped by the rights gate. Kept only where isPublicDomain === true and a file URL was published.9 shown - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 31965 matched · 40 examined · 21 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 2026-09-09 02:47 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.