Information-sharing agreements are signed, most of the time, on very specific issues--the exchange of intelligence, for instance--as they relate to specific circumstances.
If we're talking about the general conversation diplomats may have, there is no specific arrangement we have with foreign countries about these things. This is diplomacy on a daily basis. That being said, as I was saying before, there is an expectation of confidence. We are being told things, because they know that this discussion will not become public.
As the requests come in, and we're asked to release that information, there is a requirement, a polite requirement, to ask the foreign government if they would be in agreement with releasing the information. Some of the information may be substantive enough that it should be protected. On some other issues they may be willing to release it publicly, the same way they would in their own country.