License
=======

Sketchnu is licensed under the GNU General Public License (GPL) v3.0. This license
guarantees that end users have the freedom to use, modify and share the software. The
*Free Software Foundation*, which published the GPL, explains that

    * *"The licenses for most software and other practical works are designed to take away
      your freedom to share and change the works. By contrast, the GNU General Public License
      is intended to guarantee your freedom to share and change all versions of a program--to
      make sure it remains free software for all its users."*

    * *"Developers that use the GNU GPL protect your rights with two steps: (1)*
      **assert copyright** *on the software, and (2)* **offer you this License** *giving you
      legal permission to copy, distribute and/or modify it".*

You can find a copy of the lincense in the LICENSE file

License Requirements
--------------------

The GPL v3.0 License states that

    1. The Sketchnu source code must be distributed with the software
    2. License and copyright information must be included at the top of each
       source code file (more info on copyright below)
    3. If the code has been modified, there must be a notice stating that it has been
       modified, by who, and when
    4. Modifications must be released under the same license as Sketchnu (GPL v3.0 or later)

License notices
---------------
The software must include the following notices::

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

Copyright
---------
The GPL license requires that all code includes a copyright notice. The purpose
of the copyright notice is to **protect the rights of developers** by:

    * Giving them credit for their work
    * Preventing their code from being distributed under a different license without
      their knowledge/permission
    * Giving them the power to enforce the terms of the license (*e.g. take someone
      to court if they violate the license*)