Disclaimer: This article is for educational and historical purposes only. The author does not condone software piracy. Always use legally licensed software.
One infamous example was the "Devil's Own" leak. A corporate VLK (Volume License Key) was leaked by a group called "Devil's Own" which allowed users to install Windows XP Professional without ever needing to call Microsoft. Because the RTM version of XP Professional had no way to phone home to verify if a VLK had been used on 10,000 different machines, these keys circulated for years. windows xp professional rtm product key
In 2010, Microsoft officially shut down the online product activation servers for Windows XP RTM (pre-SP2). Even if you have a genuine retail key from a sealed 2001 CD case, you cannot activate it online today. You would need to call the automated phone system, and even that has been unreliable since 2018. Disclaimer: This article is for educational and historical
One well-known example from early Windows XP documentation is: FCKGW-RHQQ2-YXRKT-8TG6W-2B7Q8 One infamous example was the "Devil's Own" leak