# Attribution and licenses


## ICGC

The ED50 to ETRS89 for Catalonia file `100800401.gsb` is copyright by

ICGC, Institut Cartogràfic i Geològic de Catalunya

It is distributed under the terms of the [CC-BY 4.0](https://creativecommons.org/licenses/by/4.0/) license

https://www.icgc.cat/en/The-ICGC/Public-Information/Transparency/Re-use-of-the-information

https://github.com/OSGeo/proj-datumgrid/issues/87


## NKG

The NKG deformation file `eur_nkg_nkgrf17vel.deformation`` is copyright by

NKG, The Nordic Geodetic Commission

It is distributed under the terms of the [CC-BY 4.0](https://creativecommons.org/licenses/by/4.0/) license