This question was asked in 2017 but I believe the answer was incorrect.
Can we use images purchased with standard license for paperback novels printed by a service like KDP (Amazon) which is technically print on demand but where the image is not the primary focus of sale?
When this question was asked previously the reply was that one would need an enhanced license but the terms state all an enhanced license does is remove the 500,000 copy limitation.
We need a proper, clear definition of print on demand I believe. On other stock photo websites print on demand would mean sites like zazzle.com, but would not include services like Createspace or KDP where the paper product being printed is primarily a book and the cover is not the sole thing being sold.
The answer to this will determine if I decide to use Adobe Stock photos or return to iStockphoto for my stock images.
Print on demand, e-books and classic print runs sum up and as long as you stay under the 500k run and the picture is not the main reason people are buying, you can use a standard license. Please note that despite this, there me be other restrictions.
Regards, Abambo Hard- and Software Engineer and Photographer.