Apologies for the fisking.
One could argue that we have little more of an idea
whether
contributors have agreed to the former, than the latter.
Clicking the save button is
enough, legally, to make it GFDL-licensed. This
is a non-starter. Furthermore, we are advertised and well-known (as well
known as Wikibooks can be :P ) as being GFDL-licensed.
Firstly, there is the
inconsistency that the edit page clause doesn't mention the
possibility of dual licensing.
Nor should it - it is not the purpose of that system
message to educate the
user about licensing issues - it's purpose is solely to say "Clicking save
means it goes under the GFDL" and nothing more. That's all that's required,
and it does it's job.
Secondly, the PD clause isn't on the edit page
itself, and that on the
book sub-pages, the license is linked to, rather than quoted in full.
This is a
major issue, as it's not in edit view. Furthermore, we cannot
/require/ contributors to license their work under anything other than the
GFDL, as repeated below.
That is, of course, only a valid point as long as
Wikibooks is
required to obtain users' consent of the license in a particular way.
We are.
GFDL. You can multi-license to your heart's content, but all
derivatives of your work are GFDL-only on Wikibooks unless the other user(s)
agree to other licensing conditions. And we can't force them to do so.
If such a requirement does exist, and states that the
clause must be
placed on the edit page itself, then I think we can quite easily
reconcile this situation by modifying the current clause to mention
the possibility of other licensing.
I would be opposed to doing so for reasons
explained above. That is not the
purpose of that system message. Furthermore, for practical reasons, we can
never ensure that any page remains available under anything except the GFDL.
In fact, most modules of uim and Scratch are no longer available under their
"other" license. Finally, we cannot require users to license their
contributions to a book under anything except the GFDL. (You can't say "Your
contribs to this book are PD/CC-by-sa - if you don't like it don't edit" for
reasons that need no explanation)
I'm surprised that you would think it necessary to
delete content that
was possibly posted also under a more free a license than GFDL. At
worst, the contributions default to GFDL.
The /licensing/ goes on the chopping block
- not the book :) Of course it
remains GFDL.
Mike