A great set of questions by Jacob Kaplan-Moss about the General Public License with some great answers in the comments

An experienced software engineer with many years experience writing products for Microsooft Windows based operating systems as well as 10+ years experience hosting websites on Linux and Windows including e-commerce and CMS systems. I am quite fanatical about quality software and have been writing unit tests since 1998 and have now automated deployment of all websites and backend systems.