They know your name, address, telephone number, credit card numbers, who ELSE
is driving the car for insurance, ... your driver's license number. In the
state of Massachusetts, this is the same number as that used for Social
Security, unless you object to such use. In THAT case, you are ASSIGNED a
number and you reside forever more on the list of weird people who don't give
out their Social Security Number in Massachusetts.
-- Arthur Miller