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Machine identification code

digital watermark which certain color laser printers and copiers leave on every single printed page, allowing to identify the device with which a document was printed and giving clues to the originator

Pronunciation
/məˈʃin aɪˌdɛntəfəˈkeɪʃən koʊd/
/məˈʃiːn ʌɪˌdɛntɪfɪˈkeɪʃən kəʊd/