(a) Interested persons may, pursuant to 5 U.S.C. 552, inspect or copy any voluntary agreement, minutes of meetings, transcripts, records, or other data maintained pursuant to these rules.

(b) Except as provided by paragraph (c) of this section, interested persons may attend any part of a meeting held to develop or carry out a voluntary agreement pursuant to these rules.

(c) The sponsor of a voluntary agreement may withhold material described in this section from disclosure and restrict attendance at meetings only on the grounds specified in:

(1) Section 552(b)(1) of 5 U.S.C., which applies to matter specifically required by Executive Order to be kept secret in the interest of the national defense or foreign policy. This section shall be interpreted to included matter protected under Executive Order 12065, dated June 28, 1978 (3 CFR 1979-1975 Comp. p. 678), establishing categories and criteria for classification; and

(2) Section 552(b)(3) of 5 U.S.C., which applies to matter specifically exempted from disclosure by statute; and

(3) Section 552(b)(4) of 5 U.S.C., which applies to trade secrets and commercial or financial information obtained from a person as privileged and confidential.