Patent ID: 8893308

Claim:
A method for verifying authenticity information on an optical medium, wherein the method is carried out by a computer system, the method comprising: receiving the optical medium including a fingerprint having at least one probabilistic feature, wherein a probabilistic feature is a physical feature having both a chance to be read indeterminately as a first value and a chance to be read indeterminately as a second value; receiving an optical-DNA signature-at-issuance, including for each probabilistic feature a value corresponding to a number of times an issuance system had read each probabilistic feature as having the first value, wherein the issuance system had read each probabilistic feature plural times; calculating an optical-DNA signature-at-verification by reading each probabilistic feature plural times and assigning to each probabilistic feature a value corresponding to a number of times a verification system read each probabilistic feature as having the first value; and calculating a vector-of-differences between the optical-DNA signature-at-issuance and the optical-DNA signature-at-verification, wherein the vector-of-differences includes a maximum distance metric between the optical-DNA signature-at-issuance and the optical-DNA signature-at-verification, and wherein the vector-of-differences indicates a true positive if the maximum distance metric is less than a threshold, and wherein the vector-of-differences indicates a true negative if the maximum distance metric is greater than the threshold.