Can we agree that the purpose of copyright is to give creators a reasonable amount of artistic and commercial control over their works, and to give humanity a reasonable amount of access to our cultural heritage?
The difficulty, of course, is in agreeing on what's reasonable.
I'd give creators rights to their works for their lifetime + enough time to provide for their children, if any. So, life + somewhere between 30 and 50 years. (When the kids are grown up, they should be able to provide for themselves, especially if they are inheriting wealth from successful parents.)
If the creator is a company or other organization (which I assume is reasonable if a groups of employees create a work together at work), I suggest the company owns the right for 50 years or so after the creation of the work. I'm pretty sure any company today expects to get back the value of their investments long before that time.
My great grandfather wrote some books, including one, now that I think of it, which might make a pretty good movie, with lots of heroism and drama, and in-story reasons to let beautiful actors show a lot of skin. I see no reason why I and my cousins should have any moral right to a windfall of money if someone decided to do all the work and investments making that film, and it turned out to be a success. And if someone did find that book, and needed to ask all his descendants for permission before creating a film based on it, they would look at the number of children he had, and give up before starting.
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