Links[1] https://www.ifross.org/?q=en/creative-commons-attribution-20 [2] https://www.ifross.org/?q=en/user/login&destination=comment/reply/1314%23comment-form [3] https://www.ifross.org/?q=en/category/lizenzordnung/c-open-content-lizenzen [4] https://www.ifross.org/?q=en/category/tags/cc-20