Most of the icons have been adapted from the oxygen theme are under the LGPLv3 license. The original svg files are located in the svg directory.

For more information, please see: http://www.kde.org/

A copy of the LGPLv3 license is available at licenses/lgpl-3.0.txt

The following files are Copyright (c) U.S. Geological Survey (2012):
  ographic.png