IPR is a form of incentive for creators in service of betterment of the society (it also could be detrimental like Mein Kempf though). On the other hand real estate does not need such extra incentives. Need or greed is enough.

The book title is "Mein K_a_mpf".

It's related to the latin "c_a_mpus" / battle field -- like most European languages, there are close relationships to the neighbors. While there were shifts in sounds: in this case not.