Daniel Mayer wrote:
Or simply a FDL that requires derivative works to be licensed under one of a select list of similar viral copyleft licenses like the Creative Commons Share Alike license. That would make it possible for us to import GFDL only text into the textbook projects and then downstream users of the textbook text could choose between GFDL or Creative Commons Share Alike.
But I'm not sure if that would be legal.
If the GNU licence changes to allow this, then it's all good. That's because (and why) thing are licensed under "Version xxx or any later version of the GNU FDL". ^^^^^^^^^^^^^^^^^^^^
-- Toby