Patent 7422244 was granted and assigned to Digimarc on September, 2008 by the United States Patent and Trademark Office.
An identification document which includes card specific information printed on the card in a first location at a relatively large scale which permits the information to be read without magnification and duplicates the card specific information at a second location on the card at a significantly smaller scale which requires magnification to clearly read the small scale information. The micro-printing of small scale card specific information, such as a person's date of birth on a driver's license, at a second location on the identification card allows the micro-printed text to be compared to the large scale text to determine if the large scale text has been altered.