More and more nightclubs are using scanners to check ID on people who are entering. While it is a great way to automate the process and much more easily find fakes, it also allows them to capture all the information on the license - your name, address, birthday, license number, eye color , and other miscellaneous information. Generally they just want it for marketing information. But do you really want your average nightclub owner (even if he or she claims they are doing it securely and privately) keeping your information and the thousands of others on a CD or computer in their office or laptop just waiting to be e-mailed or given to someone to be used for annoying marketing or slightly less innocuous purposes?