Yeah, if you want to make other game, "FOnline" thing still should exist, even if you'll make Arcanum you'll have to name it something like "FOnline: Arcanum" or whatever. As you can see at this server, TLA and others, all names are "FOnline: XXX", so it shows how you can name it.
Btw I don't know if you can use Arcanum tiles, but I think you can, because SDK already has squares for it and you can switch to it and just get tiles from Arcanum's CD and it'll work normally.
License should say what you can't change, everything else you can change.