Open Source Initiative (OSI) ha approvato la European Union Public Licence (EUPL), che è compatibile con le seguenti licenze:

GNU General Public License (GPL) v. 2
Open Software License (OSL) v. 2.1, v. 3.0
Common Public License v. 1.0
Eclipse Public License v. 1.0
CeCILL v. 2.0

Fonti:

1. Notizia: http://www.informationweek.com/news/software/linux/showArticle.jhtml?articleID=215900055&subSection=News

2. Wikipedia: http://en.wikipedia.org/wiki/European_Union_Public_Licence

3. Testo integrale: http://ec.europa.eu/idabc/servlets/Doc?id=31979