The photographs used in Libre-Jigsaw are copyrighted by JS Nature Photos
<http://photos.jstechs.com/> and licensed under the Creative Commons
Attribution Share-Alike license

These are the terms of use:

 - Attribution - You must provide attribution, displaying credit to
   "JS Nature Photos", including a hyperlink to
   http://photos.jstechs.com/ if presented on a website.

 - Share Alike - If you alter, transform, or build upon this work, you
   may distribute the resulting work only under the same, similar or a
   compatible license.
