Source licensing
What you may do with the metadata each source returns through the API. OpenCITE relays metadata and links; it does not redistribute full text. Per-work content licences, where the source states one, are on each card as evidence.license. Every API response lists the licences of the sources present under licenses. A source whose terms we have not confirmed is marked unknown — that is a statement of what we know, not a grant.
| Source id | Name | Metadata licence | Note |
|---|---|---|---|
DOAJ | DOAJ | CC0-1.0 | Article metadata CC0 by DOAJ policy (doaj.md). |
OPENALEX | OpenAlex | CC0-1.0 | Metadata released under CC0 (dossier: openalex.md). |
CROSSREF | Crossref | open | "Almost none of the metadata is subject to copyright, and you may use it for any purpose"; abstracts may carry publisher copyright (crossref.md). |
CURATED | Curated Journals | CC0-1.0 | An OpenAlex filter — same CC0 metadata (curated.md). |
EUROPEANA | Europeana | CC0-1.0 | Metadata CC0; item content carries per-object edm:rights (TOS-items.md). |
MET | The Met | CC0-1.0 | CC0 declared; unrestricted commercial and non-commercial use (MET.md). |
SMITHSONIAN | Smithsonian | CC0-1.0 | Open Access metadata + designated assets CC0 (TOS-items.md). |
DPLA | DPLA | CC0-1.0 | Metadata CC0; the underlying resource is not (TOS-items.md). |
RIJKS | Rijksmuseum | CC0-1.0 / CC-BY-4.0 | CC0 / CC BY 4.0 policy; attribution requested for CC BY objects (RIJKSMUSEUM.md). |
IA | Internet Archive | no-copyright-asserted | Internet Archive asserts no copyright over metadata (INTERNET_ARCHIVE.md). |
NCBI | NCBI Entrez | public-domain | U.S. government work, largely public domain (ncbi.md). |
OAPEN | OAPEN | CC0-1.0 | Metadata CC0 1.0; PDFs CC-licensed per book (OAPEN.md). |
OPEN_LIBRARY | Open Library | no-copyright-asserted | IA/Open Library asserts no new copyright over bibliographic metadata (OPEN_LIBRARY.md). |
NORTHWESTERN | Northwestern Digital | item-level | No API licence published; each item carries rights_statement / license (NORTHWESTERN.md). |
PRINCETON_DPUL | Princeton DPUL | item-level | No API licence published; each item carries edm-rights (PRINCETON_DPUL.md). |
CHRONICLING_AMERICA | Chronicling America | public-domain | US government works / public-domain historical newspapers (CHRONICLING_AMERICA.md). |
ONB | ONB / ANNO | unknown | Terms not confirmed (ONB.md). |
BNF_API | BnF Catalogue | etalab-2.0 | Licence Ouverte de l'État (Etalab open licence, CC-BY-equivalent) (BNF_API.md). |
LC_DATASETS | Library of Congress | public-domain | US government works, public domain (LC_DATASETS.md). |
WIKIDATA | Wikidata | CC0-1.0 | Wikidata is CC0 (WIKIDATA.md). |