Accordingly, it serves to thwart people who wish to tamper with, counterfeit or duplicate a government document. It, thus, uniquely identifies each card for a given individual. The DD is a security code that identifies where and when the license was issued. A number of states started adding this piece of information to their driver’s licenses several years ago. Please see What does the DD on a Michigan driver’s license mean? DD = Document DiscriminatorĭD is an abbreviation for Document Discriminator. I first presented this information in a Quora answer that I wrote last month. However, I find this tidbit of information so interesting that I feel compelled to write about it. This post about the so-called Document Discriminatoron driver’s licenses is somewhat off-topic for this blog.
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