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Isn't this just an rfid chip?

Take it out of a real package and tape it to the machine.

Or is it more complex than that?

Easier: barcode

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/keuri... )