Every system of property is designed with one thing in mind: Scarcity.
If you take away scarcity, there's no need to have property. If my car could be duplicated infinitely so that anyone who wanted one could have one, imagine filing the police report:
Me: Someone stole my car last night!
Officer: What does your car look like?
Me: Well, I drove it here, so take a look out in the parking lot
Officer: So... Someone stole your car but yet it was there in the morning?
Officer: Was any of the gas gone?
Officer: Did the thief take anything?
Officer: Was anything broken or damaged?
Officer: So... what exactly is the crime?
Me: But... they STOLE my car!
The only "IP" worth having is trademarks because it prevents fraud (you can't have two game makers called Nintendo that both use the exact same logo because consumers will consistently be defrauded because there is no way to tell the two different products apart).