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'll make them available for the Union. And once the Investigation is complete, we'll be able to share the actual computer simulations For now, they remain confidential. We cannot afford a leak to the press. There has been far too much talk for the press already. transcripts we'll call you back . (..)2016 Sully