1Joël Krähemann <jkraehemann@gmail.com> 2Daniel Maksymow <daniel.maksymow@tuta.io> 3 4Copyright (C) 2005-2019 Joël Krähemann 5 6Permission is granted to copy, distribute and/or modify this document 7under the terms of the GNU Free Documentation License, Version 1.3 8or any later version published by the Free Software Foundation; 9with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. 10A copy of the license is included in the section entitled "GNU 11Free Documentation License". 12