Another thought on this. The protections of copyright are very broad. Perhaps overly so. They don't merely protect the work that is copyrighted, but also protect any potential derivative works that could be made from that work. Thus if I write a novel, no one else can make a movie based on that novel, even if the movie is only loosely based on the novel and is in most respects a very different work.
This very broadness of copyright protection implies that it is protection is not merely meant to protect the authors work. But such protection can be so burdensome (over the long haul) that it is unreasonable to assume that such protection should last in perpetuity.
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Bill
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