Lessig points out that for the founding fathers of our country, it was clear that an idea could not be owned. In particular, Thomas Jefferson wrote in a famous passage that, once articulated, ideas inscribe themselves into the thoughts of others. No one can rid themselves of an idea once they have it, and everyone can access the idea once it comes into existence. When Jefferson and others put clauses about copyright into the Constitution (Article 1), they had the protection of authors' expressions of ideas in mind to protect, not the ideas themselves. Locke, Lessig argues, held that if a resource had to necessarily be produced for exclusive use, then it's ownership should be a property right. However, this doesn't mean that exclusive property rights are upheld when the use of a resource is not exclusive by necessity. That is, Locke makes no claims about resources for which exclusivity is not a necessary condition for their ownership. Ideas fall into this category. So, Locke's theory is compatible with the understanding of ideas and copyright put forward in the Constitution.