Andre-
To publish something under dual license, is not
"expressly provided for
under the GNU/FDL", and it "offers terms on the work that alter the terms of
the CC license".
Not at all. It is the licensee who picks the license which he wants to
accept and ignores the other one. The publisher can offer as many licenses
as he wants -- compare Trolltech's licensing policy: GPL or proprietary.
Regards,
Erik