1. A security-enhanced document comprising: a substrate; at least one lower portion imaged with first graphic indicia, the lower portion imaging being directly or indirectly digitally imaged on the substrate; at least one release coat applied over the lower portion; at least one scratch-off coating applied over the release coat to maintain the lower portion imaging unreadable until removal of the scratch-off coating; and at least one overprint upper portion digitally imaged with second graphic indicia over the scratch-off coating, the overprint upper portion being registered to cover at least a part of the imaging of the lower portion, the overprint upper portion being associated with the second graphic indicia of the lower portion, the upper portion having at least one associated feature imaged with respect to a visual or thematic aspect of the lower portion; wherein the first and second graphic indicia include a portion having the same visual appearance and being in registration with each other, and the first graphic indicia includes another portion that does not appear in any portion of the second graphic indicia; such that gradual removal of parts of the upper portion visually creates the appearance of the imaging on the upper portion dissolving visually or thematically into the lower portion imaging as a result of (i) the portion of the first and second graphic indicia having the same visual appearance and being in registration with each other remaining visually the same during removal due to the overprint upper portion being registered to cover at least a part of the imaging of the lower portion, and (ii) the portion of the first graphic indicia that does not appear in any portion of the second graphic indicia being revealed during the removal.