All icons in the system/ directory are taken from the Humanity and Oxygen
icon sets.

The Humanity icons are licensed under the GNU General Public License version 2.
The Oxygen icons are dual-licensed under the Creative Common
Attribution-ShareAlike 3.0 License or the GNU Library General Public License.

All icons in this folder have been created from scratch for Regina, with
the follow exceptions / modifications:

- The examples icon is a copy of Humanity's help-about icon.

- The packet_view icon is taken from Oxygen, and has been modified to remove
  the minus sign inside the magnifying glass.

- The troubleshoot icon is a copy of Oxygen's dialog-warning icon.

- The x-regina mimetype icon includes the generic "sheet of paper" from the
  Oxygen icon set.

