David Goodman wrote:
do they copy as a mirror would, and then add articles
of their own, or
do they use the text as part of articles with additions & subtractions
of their own?
I believe it's the latter. They are of course free to edit as
they
will; that's allowed even if the editing is grossly distorted. Another
important feature of GFDL is the viral effect that incorporating
licensed material will have on the copyright of the new usage.
Ec