This is a difficult question (GPL is difficult!), that's why I referred to GPL FAQ. See this answer: http://www.gnu.org/licenses/gpl-faq.html#GPLInProprietarySy

This is a difficult question (GPL is difficult!), that's why I referred to GPL FAQ. See this answer: http://www.gnu.org/licenses/gpl-faq.html#GPLInProprietarySystem http://www.gnu.org/licenses/gpl-faq.html#GPLInProprietarySys... or http://www.gnu.org/licenses/gpl-faq.html#MereAggregation http://www.gnu.org/licenses/gpl-faq.html#MereAggregation Thanks for pointers to other implementations!