The Karton logo is licenced under the terms of either the GNU
LGPL version 2.1 or later (see ../COPYING.LGPL2) or the Creative
Commons Attribution-Share Alike 3.0 licence (see
https://creativecommons.org/licenses/by-sa/3.0/).

The logo is based on two different and separate designs, both
released under public domain:
 - The box icon is part of the Tango Icon Set and was designed
   by Jakub Steiner.
 - The penguin (called “stycil tux” by its author) was created
   by cheese (http://www.twolofbees.com/artwork.php?iid=870).
