GFDL
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All material (texts, images, dendrochronological data sets etc.) on this wiki (Cybis Wiki) is licensed under CC-BY-SA 3.0 and GFDL parallel, if not something else is explicitly stated. Parallel means that you are free to chose the one of the two licenses you do prefer.
- The GNU Free Documentation License (GNU FDL or simply GFDL) is a copyleft license for free documentation, designed by the Free Software Foundation (FSF) for the GNU Project. It is similar to the GNU General Public License, giving readers the rights to copy, redistribute and modify a work and requires all copies and derivatives to be available under the same license. Copies may also be sold commercially, but, if produced in larger quantities (greater than 100), the original document or source code must be made available to the work's recipient.
- The GFDL was designed for manuals, textbooks, other reference and instructional materials, and documentation which often accompanies GNU software. However, it can be used for any text-based work, regardless of subject matter. For example, the free online encyclopedia Wikipedia uses the GFDL for all of its text.[1]
For full details please read: http://www.gnu.org/copyleft/fdl.html