| 摘要 |
A method of marking an individual product with a unique code. The method can include associating the product with an indicia comprising photoactive, reflective or electromagnetic particles or combinations thereof or one or more photoactive, reflective or electromagnetic films or substrates that includes a random physical property, measuring the random physical property, and marking the product with the measured value that is specific to the product, optionally in combination with a barcode, RFID tag, lot number or the like for the product.
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