About the "README" offer you allude to, do you really think an
upstream author's statement:
Copyright blah blah blah ...
Distributed under the GNU GPL v2 ...
Source licenses for inclusion of this code in proprietary programs
are available from the author for $10,000 plus 2% of gross sales.
is modifiable? Removable sure. Maybe appendable. But modifiable?
How can it be changed? Do you think Debian could just change the 2%
to a 0.5%? Maybe give a discount to non-profits? When we talk about
code being modifiable, that's what we mean: the ability to change it
in arbitrary ways. Here, no changes are in fact possible, however you
read the license and such.