| 摘要 |
A method for verifying authenticity of an item is provided. The method comprises forming a medium containing one or more tags having a first physical or chemical state and a second physical or chemical state corresponding to an inactive condition and an activated condition, respectively. One or more tags are changed from an inactive condition to an activated condition at a point of origin upon issuance of an item formed from the medium, to provide a distinctive security label for subsequent verification of authenticity of the item.
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