This is what I don't like about the common law. The copyright law of my country, for example, explicitly defined what is copyrightable and what is not. It's the

This is what I don't like about the common law. The copyright law of my country, for example, explicitly defined what is copyrightable and what is not. It's the expression that is protected by copyright law, not the mere idea. Not by a bunch of existing case laws. An mere idea like a man was bitten by an irradiated spider and got some super natural power, or turtles by the age of 13-19 somehow mutated and become a ninja is not protected, but the expression of such idea is.