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.
(..) sensuality, and her limits of safeness. The dominant and the submissive agree and acknowledge that all that occurs under the terms of this contract will be consensual, confidential. And subject to the agreed limits and safety procedures. Set out in this contract. The submissive will agree to any... (..)2015 Fifty Shades of Grey