Maybe "law" is the wrong term, but considering this is an international treaty, there is not really a "higher up" with the authority to "approve" leaking this.

Maybe "law" is the wrong term, but considering this is an international treaty, there is not really a "higher up" with the authority to "approve" leaking this. (Unless you believe several of the nations involved are secretly governed by a higher body.) There would probably be fairly severe diplomatic consequences regardless how it leaked, and even worse if it was clearly a high-level official.