Relax, Vintage Photo Collection are royalty-free. Use the photos as many times as you like for book covers, Facebook ads, blog posts, flyers and brochures, sales material, social media posts and more... without ever worrying you'll receive notice you owe for royalties for use.
And we have only one license to worry about with our pics. Enjoy using them anyway you like without needing extended licenses. We just ask that you don't resell them as is, list yourself as the photographer, or use them on adult sites.
What could be fairer than that?