Waiver of privilege by voluntary

disclosure (a) A person upon whom these rules confer a privilege against disclosure of a confidential matter or communication waives the privilege if the person or the person’s predecessor while holder of the privilege voluntarily discloses or consents to disclosure of any significant part of the matter or communication under such circumstances that it would be inappropriate to allow the claim of privilege. This rule does not apply if the disclosure is itself a privileged communication. (b) Unless testifying voluntarily concerning a privileged matter or communication, an accused who testifies in his or her own behalf or a person who testifies under a grant or promise of immunity does not, merely by reason of testifying, waive a privilege to which he or she may be entitled pertaining to the confidential matter or communication. the privilege