some questions abuot license

[mellenor]

Now I working of computer rpg (on PDA). It would be commercial RPG.
I want take some free (GNU FDL, Free art.... ) system (cause i dont
have a time for creating something new. These Licenses allows me to create commercial games, or not? I mean i dont want money for my system (i think it will be with changes)/
But game will be for money.