The idea of assigning property rights to something that is intangible was considered radical at the outset, and remains subject to controversy to this day.
Outset, sure. Women's suffrage was controversial at the outset, and this is older than that.
You mean to tell me there's a body of legal opinion that, say, piracy of films is a perfectly legal activity?
No, I'm saying that the idea of protecting intangibles has always been a difficult concept. Hard to define, hard to interpret, hard to protect.
This difficulty leads to ambiguity, which leads to controversy.
This thread is a perfect example. How clear is it to anyone here exactly what the S&S heirs should own, and what the limits of that ownership are, both conceptually as well as over the course of time?
It's a huge mess.
As opposed to my pen, or my car, or my house. Those are easy.
The length of time that a work should be protected is equally controversial. Copyright law is supposed to provide a balance between the rights of authors on the one hand, and the interest of the public in having access to these protected works and the ideas that they contain on the other.
Anytime you increase or shorten the length of time that a work is protected, you alter that balance, along with the policies meant to be served by that balance.
How to protect intangibles is controversial. How long to protect them is controversial. How to define these concepts is controversial. How to intrepret these laws is controversial. This very discussion is controversial.