It's a bit of a grey area, but the FAQ states that so long as they're kept separate, and they communicate "at arms length", they should be ok: https://www.gnu.

It's a bit of a grey area, but the FAQ states that so long as they're kept separate, and they communicate "at arms length", they should be ok: https://www.gnu.org/licenses/gpl-faq.html#GPLInProprietarySystem https://www.gnu.org/licenses/gpl-faq.html#GPLInProprietarySy... http://programmers.stackexchange.com/questions/110380/call-gpl-software-from-non-gpl-software http://programmers.stackexchange.com/questions/110380/call-g... Disclaimer: IANAL