The GNU Free Documentation License (GFDL),See "The GNU Free Documentation
License: Version 1.1"
(March, 2000).
http://www.gnu.org/copyleft/fdl.html
meanwhile, permits the copying and distribution of a
document in any medium, provided the resulting work
carries the same license. It also permits the
modification of a document provided certain conditions.
Unlike the OPL, however, it does not give authors the
option to restrict certain modifications. It also does
not give authors the right to reject modifications that
might result in a competitive book product. It does
require certain forms of front- and back-cover
information if a party other than the copyright holder
wishes to publish more than 100 copies of a protected
work, however.
In the course of researching the licenses, I also made
sure to visit the GNU Project web page titled "Various
Licenses and Comments About Them."See
http://www.gnu.org/philosophy/license-list.html On that page, I
found a Stallman critique of the Open Publication
License.
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