'chrismcb', you wrote, "Note that it also refers to Authors and Inventors, it doesn't refer to people or corporations or groups, or anything. Just 'Author' and 'Inventor.' "
But the Constitution starts out with "We the People..."
I think that if we continue down the road of imputing personhood to every kind of grouping of persons, then we are in big trouble; and I think that if we continue down the road of conferring the rights that people have to every kind of grouping of persons, then we are in even bigger trouble.
A group of persons is not a person, just as a pack of wolves is not a wolf, a computer is not a transistor, and a brain is not a nerve cell. A group of persons has emergent properties that make is substantially different from an individual person. A person has a conscience, but large a group of thousands of persons does not. A person can put their own self interest aside and think of the greater good, but it is very unusual for a group to do that. If one were to anthropomorphize a group of persons, the group could usually be characterized as selfish and unfeeling - the characteristics of a sociopath.
Do we want the protections of the Constitution to automatically extend to such things, without some careful consideration?