Trademark/copyright issue with latest graphics for 4.0?

Hello,

Because I am well aware the trademark issue that mobilix had see:
http://mobilix.org/

I think it is dangerous to use any graphics that look similar to Aster*x
and Obel*x (and idefix): http://www.asterix.tm.fr/

Those two look like legal challenge to those defending the author:
http://www.openbsd.org/images/puffy40.gif
http://www.openbsd.org/images/openbsd40_cover.gif

If it is a Trademark issue, then they have to defend themself to avoid
loosing the Trademark protection. If it is a copyright issue... then it
is less of a problem, but they could sue for the principle (even if
there is no money to get).

I hope the poster I have will not become a collector edition following a
legal battle... at least I raised my concern about those graphics (I did
it at FOSDEM but I want to make sure it is/was discussed).

David GLAUDE