The custodian to whom any documentary material, answers to interrogatories, or transcripts of oral testimony are delivered shall take physical possession thereof, and shall be responsible for the use made thereof and for the return of documentary material, pursuant to this chapter.

The custodian may cause the preparation of such copies of such documentary material, answers to interrogatories, or transcripts of oral testimony as may be required for official use by any duly authorized official, employee, or agent of the Department of Justice under regulations which shall be promulgated by the Attorney General. Notwithstanding paragraph (3) of this subsection, such material, answers, and transcripts may be used by any such official, employee, or agent in connection with the taking of oral testimony pursuant to this chapter.

Except as otherwise provided in this section, while in the possession of the custodian, no documentary material, answers to interrogatories, or transcripts of oral testimony, or copies thereof, so produced shall be available for examination, without the consent of the person who produced such material, answers, or transcripts, and, in the case of any product of discovery produced pursuant to an express demand for such material, of the person from whom the discovery was obtained, by any individual other than a duly authorized official, employee, or agent of the Department of Justice. Nothing in this section is intended to prevent disclosure to either body of the Congress or to any authorized committee or subcommittee thereof.

While in the possession of the custodian and under such reasonable terms and conditions as the Attorney General shall prescribe, (A) documentary material and answers to interrogatories shall be available for examination by the person who produced such material or answers, or by any duly authorized representative of such person, and (B) transcripts of oral testimony shall be available for examination by the person who produced such testimony, or his counsel.

Whenever any attorney of the Department of Justice has been designated to appear before any court, grand jury, or Federal administrative or regulatory agency in any case or proceeding, the custodian of any documentary material, answers to interrogatories, or transcripts of oral testimony may deliver to such attorney such material, answers, or transcripts for official use in connection with any such case, grand jury, or proceeding as such attorney determines to be required. Upon the completion of any such case, grand jury, or proceeding, such attorney shall return to the custodian any such material, answers, or transcripts so delivered which have not passed into the control of such court, grand jury, or agency through the introduction thereof into the record of such case or proceeding.

The custodian of any documentary material, answers to interrogatories, or transcripts of oral testimony may deliver to the Federal Trade Commission, in response to a written request, copies of such material, answers, or transcripts for use in connection with an investigation or proceeding under the Commission’s jurisdiction. Such material, answers, or transcripts may only be used by the Commission in such manner and subject to such conditions as apply to the Department of Justice under this chapter.

any case or proceeding before any court or grand jury arising out of such investigation, or any proceeding before any Federal administrative or regulatory agency involving such material, has been completed, or

no case or proceeding, in which such material may be used, has been commenced within a reasonable time after completion of the examination and analysis of all documentary material and other information assembled in the course of such investigation,