Everyone knows lawyers keep secrets. Far fewer people, including a surprising number of 1Ls in October, realize that two entirely different rules do that work, with different sources, different scopes, and different exceptions. Mixing them up is one of the classic errors in professional responsibility, and untangling them is a good tour of how legal ethics actually operates.
What is privilege? A rule of evidence
The attorney-client privilege is a rule about compelled testimony. It belongs to evidence law, and it answers one narrow question: can a court force the disclosure of a communication between lawyer and client? If the privilege applies, the answer is no. The classic formulation requires a communication, made in confidence, between a client (or someone seeking to become one) and a lawyer, for the purpose of obtaining or providing legal advice.
Every element carries limits. The privilege protects communications, not underlying facts: a client cannot immunize a fact by telling it to a lawyer, and cannot make a preexisting document privileged by handing it over. Confidence matters: communications shared with outsiders, or made in their presence, generally lose protection, which is why lawyers get nervous about clients forwarding legal emails or bringing friends to meetings. The legal-advice purpose matters: business advice from a lawyer is not privileged just because a lawyer gave it, a boundary litigated constantly in the corporate world. The Supreme Court’s decision in Upjohn Co. v. United States, 449 U.S. 383 (1981), extended the privilege to communications between corporate counsel and non-management employees, rejecting the old control group test, and remains the anchor case for who counts as the client inside an organization. And the privilege has a famous carve-out: the crime-fraud exception strips protection from communications made to further ongoing or future wrongdoing. Advice about past conduct is the privilege’s core; help with the next scheme is outside it.
The privilege belongs to the client, not the lawyer. Only the client can waive it, and it survives the end of the representation and even the client’s death.
What is confidentiality? A rule of professional ethics
The duty of confidentiality comes from a different source entirely: the rules of professional conduct, enforced by bar discipline rather than by courts of evidence. Model Rule 1.6, in some version, binds lawyers in every state, and its scope is dramatically wider than the privilege. It covers all information relating to the representation, whatever the source. A fact learned from a witness, a document found in public records, something read in a newspaper about the client’s affairs: none of that is privileged, and all of it is confidential. The duty applies everywhere, not just in proceedings where testimony could be compelled. A lawyer chatting about a client’s case at a dinner party violates confidentiality even though no privilege issue is anywhere in sight.
Confidentiality has its own exception structure, and this is where the two rules most visibly diverge. The rules permit, and occasionally require, disclosure in defined situations: to prevent reasonably certain death or substantial bodily harm, to prevent or mitigate certain crimes or frauds involving the lawyer’s services, to secure ethics advice, to defend the lawyer against accusations, and to comply with law or court order. The exact list varies meaningfully by state, which is why the annual professional responsibility exam question is never quite the Model Rule.
Why does the difference matter?
Think of it as two circles. Privilege is the small, hard circle: narrow, but strong enough to stop a subpoena. Confidentiality is the enormous, softer circle: it covers nearly everything a lawyer knows, but it yields to a court order, because it was never a shield against compelled testimony in the first place. A piece of information can sit in both circles, in only the large one, or, once privilege is waived, in neither. For clients the practical lessons are simple: talk to your lawyer alone, keep legal communications off shared email, and understand that hiding a fact from your lawyer protects nothing. For law students, the two-rules structure is the whole game: on any secrets question, the first move is asking which rule is even in play.
