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.
(..) so I may put put a word in my man's ear? Yeah, I'm expecting to fall in love once I see the specimens at Candyland, so before that moment, it would be good if I could have a confidential strategy meeting with my… confidant. – You mind tellin' me what the hell you doing? – I've confirmed that (..)2012 Django Unchained