I think limiting copyright to 10 years only is a bit too strict. Sometimes, it can take ten years or more to develop sequels or movie adaptations, etc.
I do think that a relatively short period should be the baseline for copyright, but that there should be a chance to extend it for a work that is popular enough (or in some cases, so you can publish works that failed earlier in your career that find new interest once an author develops a following).
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Bill
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