Under what circumstance principle of confidentiality does not restrict disclosure of information held by the auditor that he gained during auditing?

In case that he has to defend himself in subpoena or obliged by law, also for peer review.

Auditor cannot disclose anything about the client without its permission, however if the court specifically orders to disclose something, or when the audiotr defends in a suit filed agianst him or the issue relating to money laundering or terrorism issue then the auditor is duty bound to disclose the same.