GoKawiilEx-Microsoft engineer explains how Windows XP's leaked FCKGW key bypassed activation
Retired Microsoft engineer Dave Plummer detailed on X how the infamous FCKGW-RHQQ2-YXRKT-8TG6W-2B7Q8 Windows XP volume license key spread widely despite being reserved for enterprise partners. He explained that XP's copy protection compared install keys against a heavily encrypted 10MB blob on the disc that turned out to be the old Microsoft Bob software, and that retail and volume-license media used entirely different validation keys and discs.