given a QR code which has been artistically modified, for example by stamping a logo in its center, find the minimum additional pixels which need to be altered to make the code unreadable. create an evil app, and make the modifications with a marker.
if making modifications with a black marker, we want the minimum additional white pixels which need to be turned black.
Reed-Solomon error correcting codes work extremely well when errors are random, but not so well (but still roughly as well possible) when there is an adversary trying to induce error.
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