EC 4-6.

The obligation of a lawyer to preserve the confidences and secrets of his client continues after the termination of his employment. Thus a lawyer should not attempt to sell a law practice as a going business because, among other reasons, to do so would involve the disclosure of confidences and secrets. A lawyer should also provide for the protection of the confidences and secrets of his client following the termination of the practice of the lawyer, whether termination is due to death, disability, or retirement. For example, a lawyer might provide for the personal papers of the client to be returned to him and for the papers of the lawyer to be delivered to another lawyer or to be destroyed. In determining the method of disposition, the instructions and wishes of the client should be a dominant consideration.