Take a look at:
<http://otp.inlimine.org/>
This is a project to develop "open copyrighted" textbooks. I'm not clear on
whether they plan to use the OPL license or some other form of copyleft. This
bears watching and possibly helping.
Doug Loss Democracy substitutes election by the
dloss@csrlink.net incompetent many for appointment by
(570) 326-3987 the corrupt few.
George Bernard Shaw