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. 12 shown for “Oscillatoria corakiana Playfair” — 40 records examined, 7 dropped by the rights gate.
Archives queried 2026-09-01 22:13 UTC · fetched live for this request
isPublicDomain field is true for this object.metadata_usage.access reads CC0 — a waiver, not an expired term.
Oscillatoria corakiana Playfair
Artist not stated in the record · 1914
Oscillatoria splendida var. amylacea Playfair
Artist not stated in the record · 1912 to 1913
Oscillatoria simplicissima var. constricta Playfair
Artist not stated in the record · 1916 to 1918
Oscillatoria flexa Playfair
Artist not stated in the record · 1916 to 1918
Oscillatoria formosa var. australica Playfair
Artist not stated in the record · 1914
Oscillatoria nigro-viridis f. crassior Playfair
Artist not stated in the record
Oscillatoria tenuis var. chlorina Playfair
Artist not stated in the record · 1912 to 1913
Oscillatoria simplicissima var. granulata Playfair
Artist not stated in the record · 1916 to 1918
Oscillatoria splendida var. bacilliformis Playfair
Artist not stated in the record · 1912 to 1913
Oscillatoria splendida f. clarescens Playfair
Artist not stated in the record · 1912 to 1913
Cylindrospermum stagnale var. australe Playfair
Artist not stated in the record
Phormidium numarium Playfair
Artist not stated in the record
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. The archive returned no records for this term.0 matched - Smithsonian Open Access API (api.si.edu)Rights field:
content.descriptiveNonRepeating.metadata_usage.access. 2845 matched · 40 examined · 7 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 2026-09-01 22:13 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.