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 image has been released into the public domain by its creator and original copyright holder. This applies worldwide. As such you are entirely free to reproduce it, create derivative works, or make commercial use of it as you see fit, without any requirement to give the creator credit. However, as a courtesy, a link back to AROS Public License would be appreciated. In case this is not legally possible: The copyright holder grants any entity the right to use this work for any purpose, without any conditions, unless such conditions are required by law. However, as a courtesy, a link back to AROS Public License would be appreciated.

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.