Does it matter if two people have discovered the formula for a Light spell independently? What intrinsic property of a spell makes it so that once it has been "discovered", that no one else can ever discover it without first finding the person that discovered it first?
It's not an in-game restrictions, it's an OOC restriction. We just don't want 50 identical spells. A fireball should be named "Fireball", not "My Flaming Sphere", because otherwise people will have no idea what the heck the thing does.
Again, you being the inventor of a spell doesn't mean it is yours. We may well store it and give it to someone
else as part of his starting spell collection.
