This WPA vulnerability is related to a WPA registry key which contains the ‘Last Rearm Time’. There is no limit to the number of times that the rearm count can be reset, meaning that a user could theoretically run an unlicensed copy of Windows 7 forever, without the need for proper activation, and without applying any activation hacks. Through a Windows Product Activation (WPA) vulnerability that Microsoft introduced in Windows 7, it is possible to reset the remaining rearm count back to 4. Users will then be subjected to certain annoyances such as black desktop background, repetitive notification messages stating that this copy of Windows is illegal or counterfeited, and a reminder to register the software at login. When a user uses up all three available rearms, the only option left is to enter a genuine product key to activate Windows 7, or leave the operating system in a crippled, non-genuine state. When this grace period expires, users can rearm Windows 7 for an additional 30 days, and do this up to 3 times, effectively allowing the OS to run legally for 120 days without a genuine product key. After installing Windows 7, and before activation, the operating system will run in an Initial Grace Period license status for 30 days.
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