Logo of <a href="//commons.wikimedia.org/wiki/Knoppix" title="Knoppix">Knoppix</a> (Vitruvian penguin)
<a href="//commons.wikimedia.org/wiki/User:Rugby471" title="User:Rugby471">Rugby471</a>
GPL
Own Work, based on logo found at <a rel="nofollow" class="external free" href="http://www.knopper.net">http://www.knopper.net</a>