More than a total absence of a human creative contribution, most of the cases related to computer-generated works related to the difficulty to identify the contribution of the author, although this existed. AI allows the creation of works where there is no human contribution to the creative process. Or, at least, it is not enough so we can sustain that the requirement of originality – mandatory to the protection of these kind of works – is fulfilled.
Source: Copyrights Protection of Works Generated by Artificial Intelligence