Doesn't copyright usually start from date of publication? It changes a bit for unpublished works, but otherwise a long gestation period doesn't eat into the dur

Doesn't copyright usually start from date of publication? It changes a bit for unpublished works, but otherwise a long gestation period doesn't eat into the duration of exclusivity. [1] [1] https://en.wikipedia.org/wiki/Copyright_term#Length_of_copyright https://en.wikipedia.org/wiki/Copyright_term#Length_of_copyr...