OK, pondering... I wonder if there is case law :-)
It is, as I understand it, well established copyright law (at least in UK) that a photograph of a sculpture is not a breach of copyright in the sculpture. The photograph itself is a new copyright for the photographer, but the sculpture copyright is not breached in any way.
Recently someone referred me to Big Blue Dress on youtube. The lyrics are funny, especially if you are a level 80 mage like me... And the graphics are actually really well done. I am impressed. Getting three gnomes to dance in sync can't be easy.
Then I wondered. The video. Who's copyright? The world of warcraft is a three dimensional computer model. It is a virtual sculpture. So a two dimensional still or video is like a photograph of a sculpture, surely? The art and creativity in composing the camera shots and the characters to make that video took skill. Do Blizzard own any copyright in the 2D rendering of their 3D designs?