First off, we were talking about UK law, not US law. Secondly, I think you're talking about what I described as off-the-shelf software, that is software that y

First off, we were talking about UK law, not US law. Secondly, I think you're talking about what I described as off-the-shelf software, that is software that you've developed and offer for sale to people in general. The original post was about contracted work and that's the context I was responding from. I have never heard of anyone being paid to write software specific to a business and only delivering binaries to lock the client into continuing the relationship or starting afresh.