Also, the defining feature of capitalism is that it encloses what was previously common.

Land used not to be owned (feudal lordship was functionally different than private ownership.) Then, society shifted, land became private, and that was the beginning of rent. This is enclosure.

The whole concept of IP is to explicitly extend this process to ideas -- they are not free, they are owned, and I have to pay you to use them. This is also enclosure, precisely.

almost.. you missed this part

https://en.wikipedia.org/wiki/History_of_slavery