https://txpatentattorney.com/blog/the-history-of-intellectua...
Copy rights, are not property. Patents are monopoly licenses.
You're incorrect in your use of postmodern in this and the above statement.
That’s true, property is exclusive rights. Information is a thing in which property can exist, though.
> That's the postmodern nonsense. Property takes up space.
One might choose to create a property regime in which only tangible items are subjects of property, but neither IP nor intangible property more generally have anything to do with postmodernity; while some forms of intangible property are earlier, the category (including the subcategory now known as “intellectual property”) really flowered as part of the same development of property rights that birthed capitalism.