A while back my friend Karlisson Bezerra, author of the Brazilian comic (all using open source tools such as Inkscape, etc) Nerdson, created a pretty nifty story explaining how to use the Creative Commons license. The original strip was written in Brazilian Portuguese but someone took the time to do a quick translation into English (as the translator is not a native Brazilian Portuguese speaker, some things got lost in the translation, but the end result is still worth checking).