"The purpose of property rights is the prevention of physical conflict. An essential characteristic of property is exclusivity, meaning that the use of an object by one person prevents it from being used by another.
Intellectual property and physical property cannot exist side-by-side as logically independent legal constructions. Anything that gives control over physical things necessarily limits others' control of those things, and therefore acts exactly like a physical property right. If you have an intellectual property right to your monograph, you may prevent me from copying it, thereby limiting the physical property right I have in my ink, pen, and paper."