I don't believe there's any law against "leaking" a private conversation like this. For one, there's no expectation of privacy established. For another, it's a

I don't believe there's any law against "leaking" a private conversation like this. For one, there's no expectation of privacy established. For another, it's a member of the conversation deciding to make it public. That has to be protected. I'm not sure about what legal issues might exist around intellectual property, but it must be better to make a forthright claim - "You are infringing on our IP by doing X. Please stop or we will bring legal action" compared to whatever this is.