You'll notice though, that the term 'intellectual property' wasn't invented until the (roughly) mid 20th century. After which time, copyright and patent law were affixed to this construction. There was no intellectual property, prior. I would politely suggest that this piece is a post-hoc justification, based on the ignorance of this arrangement. (Because the author, like all humans, is morally ambiguous. Intellectual property was an assumption going into this piece)

Copy rights, are not property. Patents are monopoly licenses.