Quote:
Originally Posted by j.p.s
No need to until one of them gets close, then the law will again be amended to extend them.
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Once they enter PD, they cannot be brought back to copyright. It is not the longest duration (if multiple choices apply), but the shortest that makes the work enter PD. If they grant longer duration in the future, they have to grandfather the existing law into it that makes them enter PD sooner. Every change in copyright law in the US made it easier for work to enter PD sooner than it could have - e.g. by publishing it without copyright notice, by not re-registering copyright.