experts began taking a closer look at the document, now publicly available
on the web. They discovered something else of interest: yellow dots in a
roughly rectangular pattern repeated throughout the page. They were barely
visible to the naked eye, but formed a coded design. After some quick
analysis, they seemed to reveal the exact date and time that the pages in
question were printed: 06:20 on 9 May, 2017 – at least, this is likely to
be the time on the printer’s internal clock at that moment. The dots also
encode a serial number for the printer.

These “microdots” are well known to security researchers and civil
liberties campaigners. Many colour printers add them to documents without
people ever knowing they’re there.


 http://bbc.in/2s8q3sA
 http://bbc.in/2s8q3sA+


-- 
Peterk
Dallas, Tx
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