Hi Igor, I think you can wrap mozilla with proprietary code. If you change the mozilla code itself, you have to publish the sources (of mozilla, not the surrounding app). The mpl was designed to be business friendly like the BSD. In short, the mpl was designed to allow the mozilla browser to be imbedded in an application without requiring that app to be open source. Or at least that's my understanding. But, as I indicated earlier, the copyright holder can license the same code under any terms they so desire. Regards, Cecil