A multi-ply promotional label having a detachable game piece according to the present invention includes peripheral and perforation geometry that reduces the likelihood of intentional or inadvertent premature viewing of game indicia on the detachable piece. The label, moreover, may include multiple detachable...http://www.google.fr/patents/US6272991?utm_source=gb-gplus-shareBrevet US6272991 - Method for printing a multi-ply label
