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A couple of technical reasons might be: ensuring that you can "grep" for any 4-digit year and find applicable files; or, that a "diff" makes it more obvious what is being added.

I prefer ranges personally. Also, I believe only the year of first publication is technically required anyway.

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> Also, I believe only the year of first publication is technically required anyway.

Surely adding later years must have the effect of pushing the copyright expiration date?

Not sure about US law, but in Australia, Copyright notices are not required at all, they're granted automatically under the law and only serve as a reminder -- so it's irrelevant.

https://en.wikipedia.org/wiki/Berne_Convention

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