1802.7 (H) Adverse Claims
A supplementary registration cannot be used to question or challenge the validity of a basic registration. If an applicant asserts that the U.S. Copyright Office issued a basic registration to a party who is not eligible to be named as a copyright claimant or that the application for the basic registration was filed by a party who was not authorized to register the claim, the applicant should not submit an application for supplementary registration. Instead, the applicant should assert an adverse claim in the copyright by submitting a new application for a new basic registration on behalf of the party who should have been named as the copyright claimant. See 37 C.F.R. § 202.3 (B) (11)(iii). For a discussion of the practices and procedures for asserting an adverse claim, see Section 1808.