(c) Interim sanctions which may be imposed include any sanctions that are necessary to protect the rights of the Department, authorized agency of the involved FTA country, or others, including, but not limited to:
- (1) Denying a person further access to proprietary information;
- (2) Barring a person from representing another person before the Department;
- (3) Barring a person from appearing before the Department; and
- (4) Requiring the person to return material previously provided by the Department or the investigating authority of the involved FTA country, and all other materials containing the proprietary information, such as briefs, notes, or charts based on any such information received under a protective order or disclosure undertaking.