; and (2) the Copyright Claims Board may request or permit parties to make submissions addressing relevant questions of fact or law, or other matters, including matters raised sua sponte by the Copyright Claims Officers, and offer responses thereto. (m) Discovery Discovery shall be limited to the production of relevant information and documents, written interrogatories, and written requests for admission, as further provided in regulations established by the Register of Copyrights: Provided, however , That— (1) upon request of a party, and for good cause shown, the Copyright Claims Board shall have the discretion to approve additional limited discovery in particular matters, and may request specific information and documents from participants in the proceeding and voluntary submissions from nonparticipants; (2) upon request of a party, and for good cause shown, the Copyright Claims Board may issue a protective order to limit the disclosure of documents or testimony that contain confidential information