More advanced spells like teleportation, farsight, polymorph and the likes probably aren't quite as easy. Everyone's inherently able to cast those spells, but that doesn't mean you can just do it. It'd probably be more like a well crafted piece of software, you understand what it does but without the source code you can't just go around duplicating it.
Why not? All our characters are expert programmers? Just because I don't duplicate the source code character-for-character doesn't mean that I can't get the same effect. There are, after all, many different programming languages, formatting conventions, etc.
There will be only one Fireball spell, making up your own won't work.
So, once someone creates a spell for a ball of fire that flies out and blows up, no one else can ever make a spell that has a ball of fire that flies out and blows up? Or does that mean that I can't call mine "Fireball", it has to be called "Indirik's Spherical Conflagration"? Or perhaps mine has to have blue fire, instead of orange fire? Or it's made of hot plasma instead of burning fire?
I'm not trying to be argumentative, here. I'm just trying to get a better understanding of the system. It seems to me that if once the generic spells have been designed, that creating new ones will get more and more difficult. So the people that start first, and especially the ones that "register" all the common spells, will have a huge advantage over the people that start later.
