>> If Tomcat were under GPL, we wouldn't be using >> Tomcat. Simple as that. > > You most likely would, since you are insulated from the tomcat > implementation by the servlet/jsp/jsf/whatver interface specification. Corporate lawyers don't want to even here the word GPL, much less debate what makes something a derivative work. In a company large enough to have its own lawyers, just mention the word GPL related to one of your software releases and see what happens :)