Retroactive Copyright of Live Events
In Joe Hand Promotions, Inc. v. Griffith, here was no copyright registration at the time of Mayweather v. McGregor Fight but the Copyright Act allows registration of live events within three months, and Showtime applied then transferred the rights to Joe Hand Promotions.
Floyd Mayweather Jr Conor Mcgregor Joe Hand Promotions Inc Us Court Sixth Circuit Joe Hand Promotions
Source: natlawreview.com