Links[1] https://www.ifross.org/?q=category/lizenzordnung/open-source-lizenzen/ii-lizenzen-strengem-copyleft-effekt/gplartige-lizenzen [2] https://www.ifross.org/?q=category/tags/version [3] https://www.ifross.org/?q=category/tags/20 [4] https://www.ifross.org/?q=category/tags/ecos-license