I have a client who owns a copy of XF. The client wants me to customize it. To develop those customizations, I would like to copy the client's site to my test server, where no one but the client and me ever see it. Do I have to buy the same type of license as I would for running XF as live site? Any information you can provide would be much apprecited. For what it is worth I want to say, I have come to see this is some special software. I am very pleased to have an opportunity to work with it.