Licensing is a real mess, but actually there is a handy compromise in this case - particularly in the case of logos. Armin should try the Mozilla Public License

Licensing is a real mess, but actually there is a handy compromise in this case - particularly in the case of logos. Armin should try the Mozilla Public License [http://www.oss-watch.ac.uk/resources/mpl.xml http://www.oss-watch.ac.uk/resources/mpl.xml] which exists pretty much to do exactly what he wants to do. Ever notice how Debian has "Iceweasel" instead of "Firefox?" Same product - different logo and mascot. That's because "Firefox" is a trademark, and the Mozilla Public License says you have to follow the trademark restrictions of the original author.