| Reference setting per DOI prefix . | What this means for reference distribution . |
|---|---|
| Closed | These references are only used for the Crossref Cited-by service (members-to-members) and are not distributed via any of the public interfaces or APIs. |
| Limited | In addition, organizations that sign an agreement for Crossref’s Metadata “Plus” subscription-based service can access these references. (This is the default for older membership accounts pre-2017.) |
| Open | Everyone can access these references through our open APIs. (This is the default for accounts joining from 2018.) |
| Reference setting per DOI prefix . | What this means for reference distribution . |
|---|---|
| Closed | These references are only used for the Crossref Cited-by service (members-to-members) and are not distributed via any of the public interfaces or APIs. |
| Limited | In addition, organizations that sign an agreement for Crossref’s Metadata “Plus” subscription-based service can access these references. (This is the default for older membership accounts pre-2017.) |
| Open | Everyone can access these references through our open APIs. (This is the default for accounts joining from 2018.) |