Most of the files are

  :Copyright: This stylesheet has been placed in the public domain.
  Copyright  2016 ACSONE SA/NV (<http://acsone.eu>)
  Copyright 2004-2010 Tiny SPRL http://tiny.be
  Copyright 2010-2012 ChriCar Beteiligungs- und Beratungs- GmbH
  Copyright 2015 Antiun Ingenieria, SL (Madrid, Spain)
  Copyright 2016 ACSONE SA/NV (<http://acsone.eu>)
  Copyright 2017 LasLabs Inc.
  Copyright 2018 ACSONE
  Copyright 2018 Camptocamp
  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.