Images from various external sources:

bociek.png, icon64.png	- Public Domain, http://www.inf.sgsp.edu.pl/pub/MALUNKI_DUZE/PLD_DUZE/czarny.svg
pld logo		- http://pl.docs.pld-linux.org/zrzuty_ekr/logo_01.png
wetterhorn.png		- GPL, http://kde-look.org/content/show.php?content=27325
stork.png		- unknown, http://www.wallpaper.net.au/wallpaper/animals/Stork%20-%201024x768.jpg
chmury.png		- permission to use unchanged only with pld-about
