In that case I still dont get the sentence I declared false.
Did you check the two links, where you can see that years are, (ok,
not removed but added) where they first where not.
Like 1990, 1994, 1999, 2001 becomes 1990-2018
That is a common behaviour.
Quoting "Alfred M. Szmidt" <address@hidden>:
But it stays confusing, because one file excists in many places
and the only difference between them is the copyright years.
It is not just the file as such that copyright falls under, but the
project as a whole.
You can also remove all years, accept the first?
No, you can never remove the years. It is one year for every read the
file was published.
Than you always use year-year.
That is different, that is a range of years -- not removing years.
This sometimes works, sometimes it does not if there was a gap in
publication.