This is why it is important to develop people skills as well as technical ones. I would approach this as a question to the client. “Do you want me to review the design for potential security flaws? I have had some experience at uncovering those in the past.” I would do this via email and save the answer. That should cover the legal end of it. - it also helps to wear a tight shirt, but that only works for some of us - :<) :-D

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