Clear case of copyright infringement.They did mention the renderosity namesof ther creators but if they think that gets them off the hook they are badly mistaken. Copyright holders don't just have the right to be rcognized by name as the creators of their works, they also have the sole right to decide about further use, copying and distribution of those images. All of this has been violated here.

You could demand them to take this down and  even demand damages in the form of compulsory license fees. Actually that would be a fun case. I am a self-employed lawyer working in IT law and Intellectual property law in this jurisdiction. I am always happy to pursue such cases. If you wanna give them some fire,drop me a PM. ;)