Re: Adding missing copyright years

[Richard Stallman]

    So, in principle, updating the copyright might not just entail adding
    copyright years but also taking them away.

Yes, in some cases.

                                               However I still don't understand
    what the problem is if the copyright includes years for which the there
    are no copyrightable changes.

We would in some sense be making a false statement, and that might
be embarrassing some day.  We should try our best to avoid inaccuracy.