Re: licence?

Ils l'évoquent dans un article du blog :

As usual, all our work will be made available here as Creative Commons (CC-BY-SA in this case). It will be a more complicated CC this time though, because we base it on copyrighted works by a Dutch cartoonist - who doesn’t want his original characters themselves to become CC.
Luckily the Creative Commons supports this - for as long we prominently mark what’s ours (and what gets CC’ed), and what’s copyrighted by a third party (the character designs). We’ll add a CC FAQ here to explain this further later.