“When the copyrighted works ‘consists[s] of sounds, images, or both, the first fixation of which is made simultaneously with its transmission’—that is, when the copyrighted work is a broadcast of a live event—then the Copyright Act allows an owner to sue for infringement of an unregistered copyright so long as the owner registers the copyright within three months of the live broadcast,” Judge Eric L. Clay wrote on behalf of the unanimous three-judge panel.