Hello, Is there any documentation somewhere on the impact of the mixing of licenses between ZPL and GPL, for a Zope site ? For instance, suppose I develop for a customer a business application with Zope (ZPL) and MetaPublisher (MPL - Mozilla) , and that a very independant part of the application is just having Zwikis (GPL) for ordinar use without modification. What does apply to my application itself ? My understanding is that my application is not GPLed if it does not rely specifically on a GPL module. Do you agree ? And what about GPL Python modules ? Python being an interpreted language, what is the impact of a GPL python module over the general license issue ? More. MySQLdb has a choice of license between GPL and the original license based on Python 1.5.2's license. It has a C module _mysql.c that is linked with the Python executable. What would be the status of my application using Zope and MySQLdb, if the only choice was GPL for _mysql.c ? Although it is not of paramount importance, this license issue worry customers for which we develop applications, even if they do not plan to redistribute the application. I would like to give an answer that is generally accepted in the Zope community. Thanks, Bruno Borghi http://www.akeirou.com