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In the first (1) 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 (2) 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. Please remember the above warning! Once you have contributed to the KANOTIX Documentation Wiki, you otherwise enforce a removal of what you have written!
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