corpus_gnd.jsonl and gnd_fields.jsonl are derived from the Gemeinsame
Normdatei (GND) of the Deutsche Nationalbibliothek, read through
lobid-gnd (https://lobid.org/gnd), and carry the GND's license.

The Deutsche Nationalbibliothek states that the GND authority data "is
available free of charge for general use under Creative Commons Zero
(CC0 1.0) terms."
https://www.dnb.de/EN/Professionell/Metadatendienste/Datenbezug/geschaeftsmodell.html

CC0 1.0 Universal: https://creativecommons.org/publicdomain/zero/1.0/

No attribution is required; this file credits the source anyway.
Source: Gemeinsame Normdatei (GND), Deutsche Nationalbibliothek, via
lobid-gnd (hbz). Each line of gnd_fields.jsonl names its record's GND
id, resolvable at https://d-nb.info/gnd/<id>.
