Le logiciel est distribué sous la Scratch licence : http://info.scratch.mit.edu/Scratch... qui me semble plutôt libre :
"Permission is hereby granted, free of charge, to any person obtaining a copy of this software and accompanying documentation and media files (the "Software") to distribute the Software, including the right to use, copy, publish, or distribute copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies of the Software."

Les sources sont disponibles : http://info.scratch.mit.edu/Source_... (donne aussi des informations en plus sur la licence).

Le contenu du site est publié sous cc-by-sa : http://info.scratch.mit.edu/Scratch...