a piece of printed material has preprinted , hidden data and includes a structure which prevents premature or unauthorized revealing of the hidden lottery or gaming data . for example , an instant scratch - off lottery ticket according to the invention includes a substrate , an ink layer disposed on the substrate , the ink layer including hidden lottery data . an ink - receptive layer is provided between the ink layer and the substrate and includes a first security mechanism for preventing unauthorized detection of the hidden data . a second security mechanism is disposed between the ink - receptive layer and the substrate which further prevents unauthorized detection of the lottery data .