There is still some value in being able to disclose some private data without disclosing whether further private data exists. The other party will not know afte

There is still some value in being able to disclose some private data without disclosing whether further private data exists. The other party will not know after a revelation if they have obtained the totality of secret data and must decide whether to continue to hit you with the wrench on the off chance that more secret data exists. This is a well known dilemma when interrogating people, since there's no known metadata about how many facts exist in your brain. As the GP points out, though, a common authoritarian response to this dilemma is to just keep torturing.