Hello, >If I develop a framework or classlib while under the employ of a client, the client owns it and I must ask for their permission to re-use it. If I bring in a framework or classlib into a project it remains *mine* and they must negotiate with me to >re-use it in any form outside of the original application that they contracted me to provide. I got your point of view, but there is one question: how do you prove that they not use your framework or classlib (or whatever else) without your permission?