39 CFR §3011.101

1. (a)Non-public materials means any documents or things that are provided to the Commission and identified as containing non-public information. The Postal Service may claim that information that would be exempt from disclosure pursuant to 39 U.S.C. 410(c), 504(g), 3652(f), or 3654(f) is non-public information. Any person other than the Postal Service with a proprietary interest in the materials may claim that information that would be protectable under Federal Rule of Civil Procedure 26(c) is non-public information. Any person may claim that information that is exempt from public disclosure under 5 U.S.C. 552(b) is non-public information. Non-public materials cease to be non-public if the status has expired or has been terminated by the Commission pursuant to this part. Except as provided by § 3011.205, non-public materials cease to be non-public if the submitter publicly discloses the materials with the consent of each affected person with a propriety interest in the materials (if applicable). The cessation of non-public status applies to the particular document or thing and the particular information contained therein (in whole or in part, as applicable).
2. (b)Submitter means any natural or legal person, including the Postal Service, that provides non-public materials to the Commission and seeks non-public treatment in accordance with the rules of this part.