In which case, maybe it's classified as a derivative work of the original OS project? This is how WordPress tries to classify third-party themes and plugins, me

In which case, maybe it's classified as a derivative work of the original OS project? This is how WordPress tries to classify third-party themes and plugins, meaning they should "thus inherit the GPL license". See: http://www.wordpress.org/about/license/ http://www.wordpress.org/about/license/