Tech: PDF file: how do photocopiers decide not to photocopy modern banknotes? ‘a geometric pattern … of five 1 mm large circles’. Fascinating stuff from Markus Kuhn, as usual! (via HackThePlanet)
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Tech: PDF file: how do photocopiers decide not to photocopy modern banknotes? ‘a geometric pattern … of five 1 mm large circles’. Fascinating stuff from Markus Kuhn, as usual! (via HackThePlanet)
Comments closed