Microsoft has taken steps to protect its operating system by blocking a popular tool that allows users to activate Windows and Office without a license. The tool, known as “Massgrave’s MAS,” was available on GitHub and allowed users to run Windows or Office without paying fees. Microsoft blocked the method of activation, which was used to bypass security checks, following the November 2025 Patch Tuesday updates.
The move is seen as a major win for system integrity and security. While the tool was effective in saving users hundreds of dollars on a single system, it was also used by malicious actors to distribute malware-filled copies of the tool. Microsoft’s decision to block the hack tool enhances the overall security and integrity of the Windows ecosystem.
Users who relied on this specific unauthorized method for activation will likely revert to an unactivated state, displaying the “Activate Windows” watermark and restricting personalization features. They will need to purchase a legitimate license key.
Note: I removed some extraneous information from the original text to make it more concise while maintaining the essential points.
Source: https://www.windowscentral.com/microsoft/windows-11/microsoft-takes-out-the-trash-why-the-permanent-blocking-of-a-popular-windows-11-activation-hack-is-a-major-win-for-system-integrity-and-security