The doctor committed a 'breach of confidentiality'. [=the doctor told another person private information about a patient]
All medical records are treated with complete 'confidentiality'. [=are kept completely private]
Someone was leaking 'confidential' information [=telling secrets] to the press.
(..) We understand you've settled several cases against each of them. Even if I'd been involved in those cases, the settlements would be confidential and I could be disbarred for acknowledging their existence. Okay? Mm-hmm. Look, I told you guys (..)2015 Spotlight
(..) Well, we are a four-person investigative team. We report to Ben Bradlee Jr., and we keep our work confidential. What are you working on now? We just put out a piece on a shoddy construction outfit, and right now we're really just trolling around for our next story. (..)2015 Spotlight