Re: Adding missing copyright years

[Glenn Morris]

Richard Stallman wrote:

> So the question, for each year, is "were substantial changes made
> during that year". If yes, that year should be mentioned.
[..]
> Substantial means adding up to more than 10-15 lines of total change.

What if 10 lines get changed in each year of (say) 2000-2005
inclusive? Each year, the changes are too small to be substantial. But
the net result is that the state of the code in 2005 differs
substantially from that of 2000 (by 60 lines in this example). How is
the copyright header supposed to deal with this kind of gradual,
cumulative change?