I like anything involving "until the death of the author(s)".
To me, that says that if the author is an unnatural entity that cannot die, copyright expires at the "+X" part, which I would set at about half an hour. I'm not so sure about the idea that there must be exactly one author, I'd rather allow multiple authors.
We will also need to revise this once people stop dying, obviously.
Perhaps 20 years would be a simpler idea.
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