The Copyright Act allows creators of original works of authorship to register their copyright claims with the U.S. Copyright Office. Although registration is not a precondition for copyright protection, registration is required before an infringement action can be brought, and knowing inaccuracies in a registration may be used by an accused infringer to invalidate a copyright. We report here on Unicolors v. H&M Hennes & Mauritz, L.P., in which the U.S. Supreme Court is considering the standard by which an accused infringer must demonstrate that a copyright registrant knew of inaccuracies in a copyright registration. 959 F.3d 1194 (9th Cir. 2020), cert. granted, 141 S. Ct. 2698 (2021). The outcome of this case may affect the ability of accused infringers to avoid liability by relying on inaccuracies in copyright registrations.