The DD has its originated in the 2005 federal Real ID Act. Note that the document discriminator does not include the driver’s license number. Accordingly, it serves to thwart people who wish to tamper with, counterfeit or duplicate a government document. The DD is a security code that identifies where and when the license was issued. It, thus, uniquely identifies each card for a given individual. A number of states started adding this piece of information to their driver’s licenses several years ago. DD = Document DiscriminatorĭD is an abbreviation for Document Discriminator. This post about the so-called Document Discriminatoron driver’s licenses.