Русско-англо-русский юридический словарь

Legal professional privilege is the principal reason why inspection of documents is refused, and is regarded as a fundamental principle of justice. It is an exception to the general cards on the table outlook of the CPR. Privilege discloses a substantive right to keep privileged material confidential not only in the context of litigation, but generally. (Wikipedia)

Attorney–client privilege or lawyer–client privilege is the name given to the common law concept of legal professional privilege in the United States. Attorney–client privilege is "[a] client's right to refuse to disclose and to prevent any other person from disclosing confidential communications between the client and the attorney." (Wikipedia)