37 C.F.R. § 231.2
A party may not file for review of the Board's final determination by the Register of Copyrights unless it has first filed, and had denied, a request for reconsideration. Where the Board has denied a request for reconsideration, the party who requested reconsideration may request review of the final determination by the Register of Copyrights. Such a request must be filed within 30 days of the denial of a request for reconsideration, shall be no more than 12 pages, and shall meet the requirements set forth in § 220.5(b) of this subchapter. The request must include the reasons the party believes there was an abuse of discretion in denying the request for reconsideration. The request must be accompanied by the filing fee set forth in 37 CFR 201.3(g)(3) .
37 C.F.R. §231.2