Copyright infringement
The photos had been sold widely by David Slater, a professional nature photographer, whose camera was temporarily carried away by a group of macaques. After the photos were uploaded to Wikipedia, the organisation refused to delete them, claiming "This file is in the public domain, because as the work of a non-human animal, it has no human author in whom copyright is vested. In December 2014, the United States Copyright Office stated that works created by a creature that isn't a human, such as a photograph taken by a monkey, are not able to be copyrighted. Several legal experts in the US and UK suggest that Slater's role in the photographic process would be enough of a valid claim for copyright, although the court would need to decide if that claim is still valid.