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I don't see any reason it should be longer than patents (20 years).

Why should authors be granted vastly larger IP protections than inventors?

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Because Disney paying ever-increasing fees to keep Snow White is not particularly harmful. Vs. if we allowed ever-extending patents on essential medicines and foundational technologies? How much could the heirs of the Wright Brothers add to the price of every plane ticket?
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How many years of monopoly is enough? And why not ought works be explicitly registered for such protections?
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