It's not art meant for viewing pleasure, as far as I understand the intended use is rather as a reference work. I.e., the artist who uses the book should base their art on the photographs in the book (but of course without copying, unless they get a license to do so).
I should base my art on the photos without copying. If it's just for me to look at and not copy, why the CD? I can look at the printed picture to base my art on that.
Here is the amazon blurb "ready to be used in your designs, presentations, or comps, as backgrounds or for general visual information"
