Links
[1] https://ifross.org/?q=en/gnu-free-documentation-license-fdl-v-13
[2] https://ifross.org/?q=en/user/login&destination=comment/reply/1377%23comment-form
[3] https://ifross.org/?q=en/category/lizenzordnung/c-open-content-lizenzen
[4] https://ifross.org/?q=en/category/tags/gnu-free-documentation-license
[5] https://ifross.org/?q=en/category/tags/fdl
[6] https://ifross.org/?q=en/category/tags/gfdl-13