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As the paper moves through the printer, tiny yellow dots are also printed across the page. These dots are placed in a tight grid pattern, so small that you can't see it. They go between the lines, along the edges, and even in the blank spaces. And each set of dots form a pattern that stays perfectly aligned. This pattern holds a hidden code, showing exactly when and where the page was printed, meaning printed pages can be traced back to the exact machine that
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was printed, meaning printed pages can be traced back to the exact machine that made it.
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