“Released ISSN data” is a core set of bibliographic data elements that constitute a basic form of description for a serial publication in the ISSN Register. This core set of data is made available to users free of charge via the Free Access Portal. This “Released ISSN Data” is limited to:

- ISSN

- ISSN-L

- Other ISSN (Suppressed, cancelled or incorrect ISSN)

- Title proper (title as it appears on the preferred source of information for the resource)

- Key-title (standardized and unique form of title derived from the title proper, created by the ISSN Network)

- Country

- Medium

- URL of the digital resource

- Date of last update of the record

- ISSN National Centre responsible for the record.

Released ISSN data is under licence CC BY-NC-SA (Attribution-NonCommercial-ShareAlike).