So, they had an 8-1/2 x 11 page on the photocopier, complete with the security background and a (let’s say) 5x5 hole cut in it. Then they laid the book over the hole so that the security backgrounds of the paper and the book perfectly aligned. Then they pushed the copy button.
I’d say that’s near impossible to do.
Somebody should try opening this PDF document in a PDF editor ...
Yes, very interesting!! If you look closely, where the page is bent back from the copier, the security background does not bend with the page. In other words, the security background is “laid over” the entire page...