This screenshot either does not contain copyright-eligible parts or visuals of copyrighted software, or the author has released it under a free license (which should be indicated beneath this notice), and as such follows the licensing guidelines for screenshots of Wikimedia Commons. You may use it freely according to its particular license.
Free software license:
This work 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 2 of the License, or any later version. This work 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 version 2 and version 3 of the GNU General Public License for more details.http://www.gnu.org/licenses/gpl.htmlGPLGNU General Public Licensetruetrue
Note: if the screenshot shows any work that is not a direct result of the program code itself, such as a text or graphics that are not part of the program, the license for that work must be indicated separately.
This image is used on a user page of a Wikimedia user and is stored on Commons according to the rules set out in Commons:Project scope#File in use on Commons only: the uploading of small numbers of images (e.g. of yourself) for use on a personal Commons user page is allowed or Commons:Project scope#File in use in another Wikimedia project: the uploading of small numbers of images (e.g. of yourself) for use on a personal user page of another project is allowed as long as that user is or was an active participant on that project. If the image ceases to be used it may be eligible for deletion as it may have no educational purpose.