this is why i dont work work with clients anymore. Think about all the time you are now spending on this bullshit. think about all the time you have to spend educating the client on the nuances of every deal. Even if things are 1000% clear, they can still sue you, they just can't win, but it takes time and money in the meantime.
Not saying you can't get sued without clients, but having to deal with stupid shit like this is the whole reason i stopped coding for clients and became an affiliate marketer.