Editing SklogWiki:Copyrights

'''Important note:''' 
== Contributors' rights and obligations ==

If you contribute material to SklogWiki, you thereby license it to the public
under the [http://www.gnu.org/copyleft/fdl.html GNU Free Documentation License] (GFDL) (with no invariant sections, front-cover texts, or back-cover
texts).
In order to contribute, you must be in a position to grant this
license, which means that either
* you hold the copyright to the material, for instance because you produced it yourself, or
* you acquired the material from a source that allows the licensing under GFDL, for instance because the material is in the public domain or is itself published under GFDL.

In the first case, you retain copyright to your materials. You can later republish and relicense them in any way you like. However, you can never retract the GFDL license for the versions you placed here: that material will remain under GFDL forever.

In the second case, if you incorporate external GFDL materials, as a requirement of the GFDL, you need to
acknowledge the authorship and provide a link back to the network location of the original copy.