Our main product is a desktop application built on top of the Firefox web browser. It is triple licensed GPL/LGPL/MPL. We make money by selling add-ons and a plus version, all of which is also sold under an OSS license (modified BSD). Similar to what Red Hat does, we modified the BSD to prohibit the use of our trade name (International registered wordmark) in any secondary distros of our OSS. In the end, all you have is a brand. Protecting that, protects the revenue stream.