Hi, I have the Standard Licence, and I was curious about the restrictions. I am using the images for books that I am writing. Could this possibly violate the restrictions? The only time it would actually be printed would be to use as bookmarks, teasers and paperbacks of the book. If it gets to hit the 500,000 viewer mark, would I need to find different images and redo the cover because of the restrictions? I'm not selling the images alone or to another person to use.