Links
[1] https://www.ifross.org/?q=en/which-licenses-gplv3-compatible
[2] https://www.ifross.org/?q=welchen-lizenzen-gplv3-kompatibel
[3] https://www.ifross.org/?q=en/category/faq-ordnung/iv-gnu-general-public-license-gpl-version-3
[4] https://www.ifross.org/?q=en/when-gplv2-used-and-when-gplv3-used
[5] https://www.ifross.org/?q=wann-findet-gplv2-anwendung-und-wann-gplv3
[6] https://www.ifross.org/?q=en/what-difference-between-gplv2-and-gplv3
[7] https://www.ifross.org/?q=unterscheiden-sich-gplv2-und-gplv3
[8] http://www.ifross.eu/en/what-types-licenses-are-there-open-source-software-and-how-do-they-differ