>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?


There has to be a measure of trust between both parties. They have to trust me to be ethical and not re-use code that they paid for; I have to them to be ethical and not re-use my code.