Maybe his information is encrypted such that it requires multiple parties to decrypt; i.e. his consent is a necessary but not a sufficient condition to decrypt

Maybe his information is encrypted such that it requires multiple parties to decrypt; i.e. his consent is a necessary but not a sufficient condition to decrypt his data, so that it wouldn't be revealed even under torture. https://en.wikipedia.org/wiki/Secret_sharing https://en.wikipedia.org/wiki/Secret_sharing