I've been a dealer for many years. I was told the term KSR dates back to the time when dealers had no computers, but the DMV did. KSR stands for Keypunch Service Request where a dealer would call the DMV who would, for a fee, punch the VIN into their computer and get the registration and history information for that dealer. The information was given verbally since fax machines weren't common. I believe you could get the information mailed to the dealership as well. We now use services that access the DMV computers, for a fee, of course.
KSR is a print out of an integrated vehicle record inquiry. This is often requested during a motor vehicle transfer to assure the new owner that there is no title fraud, past due fees, among other things. Consult the DMV for more information.