I'm a fan of shorter copyright terms, but copyright renewal requirements don't work; they impose a compliance burden on copyrightholders, and then impose another burden when trying to figure out if the copyright is up or not. Organizations simply won't bother with the cost of determining if the copyright has been renewed or not in most cases, and avoid making the book available. The effect, in a lot of cases, is the same as if there was no renewal requirement and simply a longer copyright term.
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