or other graphic overlay not shown could be incorporated into the original banner 12 for camouflaging the original orientation difference between the line screen patterns 14 and 16 such overlays can be printed separately or incorporated into the line screen patterns as higher order variations in amplitude or frequency any reproduction of such overlays would be independent of differences between the orientations of the line screen patterns 14 and 16 an alternative copy protected document 50 is shown in fig5 and 6 with latent images 60 and 62 hidden within a visually integrated setting 64 as a background u2014 together forming a banner 52 on a substrate 68 which can be overprinted by a text or graphics indicium 58 depicted by the word u201c logo u201d the latent images 60 and 62 depicting the word u201c valid u201d are formed by a line screen pattern 54 oriented at an approximately 45 degree angle to the orthogonal axes of the document 50 the visually integrated setting 64 is formed by the line screen pattern 56 also oriented at an approximately 45 degree angle to the orthogonal axes of the document 50 in addition to being oriented at the same angle e g 45 degrees the two line screen patterns 54 and.