Secondly, AFAIK, the case never ruled on whether Slater held the copyright to the photo, just whether the monkey could. The lower court said animals can't hold copyright, PETA appealed, then later decided to settle. When the US Copyright Office weighed in on the subject a few years ago they declared that the photo was not eligible for copyright:
http://www.latimes.com/local/lanow/la-me-monkey-selfie-20170...
Secondly, AFAIK, the case never ruled on whether Slater held the copyright to the photo, just whether the monkey could. The lower court said animals can't hold copyright, PETA appealed, then later decided to settle. When the US Copyright Office weighed in on the subject a few years ago they declared that the photo was not eligible for copyright:
https://arstechnica.com/tech-policy/2014/08/monkeys-selfie-c...
As far as I know, no court has overruled that position.