| 摘要 |
This invention utilizes the random unit to unit physical differences, characteristics, inherent in any manufacturing process, especially such processes which include selected key marking or printing elements of the articles design. The key elements selected are those which facilitate detection of the unit to unit differences generated, in an uncontrolled manner, by the manufacturing process. The visual appearance to the naked eye of the unit to unit differences of such key elements usually falls below the threshold of human perception, but enables their use for ant-counterfeiting purposes. |
