Even easier, it uses an infra-red light to detect a specific wavelength reflected from proprietary formulated ink markings printed around the rim of the K-cup (

Even easier, it uses an infra-red light to detect a specific wavelength reflected from proprietary formulated ink markings printed around the rim of the K-cup (source https://www.techdirt.com/articles/20140704/07112927780/keurig-begins-demonstrating-its-coffee-drm-system-as-expected-it-has-nothing-to-do-with-safety.shtml https://www.techdirt.com/articles/20140704/07112927780/keuri... )