Yes, I know exactly what you're talking about. Frequently, affiliate links/images are kept out of easily accessed public areas. I remember working on some marketing material using Intel, Microsoft, Asus, NVidia, and many other copyrighted affiliate images for large corporations. There was a whole list of certain, specific images to use. Some of them, like Intel and Microsoft, even go so far as to have specific requirements as to where on the page the image is allowed to be located, how close to other things it can be, what other images can and cannot be allowed to be printed on the same page, etc. Trust me, it gets really complicated with some companies.
That's why I suggested that the best thing to do would be to simply go right to the source and find out, to be sure. Good luck to you.