Most of the files are

  * Copyright 2017 Antonio Esposito <a.esposito@onestein.nl>
  * Copyright 2019 Iryna Vushnevska <i.vyshnevska@mobilunity.com>
  * Copyright 2021 Chandresh Thakkar OSI <cthakkar@opensourceintegrators.com>
  * Copyright 2021 Stefan Rijnhart <stefan@opener.amsterdam>
  :Copyright: This stylesheet has been placed in the public domain.
  Copyright 2015 Anubía, soluciones en la nube,SL (http://www.anubia.es)
  Copyright 2017 Antonio Esposito <a.esposito@onestein.nl>
  Copyright 2017 Onestein (http://www.onestein.eu)
  Copyright 2021 Opener B.V. <stefan@opener.amsterdam>
  Copyright 2021 Tecnativa - Víctor Martínez
  Copyright 2018 Flectra Community

Many files also contain contributions from third
parties. In this case the original copyright of
the contributions can be traced through the
history of the source version control system.

When that is not the case, the files contain a prominent
notice stating the original copyright and applicable
license, or come with their own dedicated COPYRIGHT
and/or LICENSE file.