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jigzo Source-code:

Licensed under GPL v2, see GPL.txt

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Images:

 - train, blackberry, bike, goat, gorilla, horse, bird, clouds, castle, 
   train, tobogan: 
   
   Photographs by Maarten de Boer
	Licensed under GPL v2, see GPL.txt, where the photographs are being
   considered part of the programs source code. 

 - heli:

   Photograph by Joana Clotet
	Licensed under GPL v2, see GPL.txt, where the photographs are being
   considered part of the programs source code. 

 - penguin:

   Obtained from:
   http://commons.wikimedia.org/wiki/Image:Penguins_111602.jpg
   The original image comes from http://pdphoto.org/ and has been
   placed in the public domain by it's author Jon Sullivan
 
