Ex-MS engineer reveals the story behind the infamous ‘FCKGW’ Windows XP key: ‘Pirates started baking the key into images or just writing it on the CD with a Sharpie’
Ex-Microsoft engineer David Plummer, who served as the primary author of Windows XP’s Product Activation system, has shared inside details about the infamous “FCKGW” product key that became ubiquitous on pirated copies of the operating system during the early 2000s.
The FCKGW key gained notoriety as the de facto serial number for illegally distributed Windows XP installations. According to Plummer, pirates widely distributed and reused the key by embedding it into disk images or physically writing it on CD media with a Sharpie marker.
Plummer’s testimony provides historical context for one of software piracy’s most recognizable artifacts. He indicates that the most plausible origin of the key is a leak from an original equipment manufacturer (OEM) or hardware partner who received final release media in advance, allowing them to preload Windows XP on PCs in time for the OS’s launch day.
The revelation sheds light on a notable chapter in Windows history, when product activation represented Microsoft’s attempt to combat software piracy through technical authentication measures. Despite these efforts, the leaked FCKGW key became so widespread that it effectively defeated activation protections for vast numbers of installations, making it a symbol of the era’s piracy challenges.