KindEditor License

The source code is distributed under the LGPL, so you have the freedom to use it however you want. 
The full text of the license can be found http://www.opensource.org/licenses/lgpl-license.php

The icons is from Oxygen icons. Oxygen icon theme is dual licensed. 
You may copy it under the Creative Common Attribution-ShareAlike 3.0 License or the GNU Library General Public License.
http://creativecommons.org/licenses/by-sa/3.0/