Microsoft has announced a major tightening of its corporate Windows activation mechanism. Starting in August 2026, mandatory attestation based on a Trusted Platform Module will be introduced for the Key Management Service, significantly complicating the use of popular piracy methods for activating the operating system, reports infohub.kz.
With the release of Windows 11, Microsoft made TPM a standard component of modern PCs, requiring motherboard and processor manufacturers to support it. Now the company is using this hardware module not only to enhance operating system security but also to protect the Windows activation process in corporate environments.
The new KMS Hardware Secured feature adds hardware-based protection to the Key Management Service. TPM will be used for cryptographic verification of the legitimacy of the server hosting the KMS infrastructure. According to Microsoft, attackers have for years exploited the KMS mechanism to fake Windows activation, allowing them to bypass license purchases while creating additional security risks.
The TPM-based attestation mechanism will work in several stages. First, the module will verify the hardware identity of the KMS host and confirm that the server has passed Microsoft's validation as a legitimate device. Then the system will ensure that the server has not been altered or compromised. After that, the trusted KMS host can process bulk Windows activation requests within organizations.
Microsoft said that TPM attestation will become a mandatory requirement for KMS activation in the next release of Windows Server. Starting in August 2026, the company will begin informing corporate customers about the readiness of Windows Server 2025 to transition to the new protection scheme. System administrators are advised to check in advance whether their existing KMS infrastructure meets the new requirements and is prepared for hardware-based activation.
"As Windows security evolves, trusted activation infrastructure will play an increasingly important role. KMS Hardware Secured helps prepare your environment for the future while aligning with Microsoft's ongoing investments in hardware trust," the company stated.
The change could significantly impact common KMS-based Windows piracy tools. In 2025, Microsoft already closed the KMS38 activation method, but the traditional Online KMS scheme continued to function.
One of the most well-known projects in this area is the open-source Massgrave toolset, which offers several unofficial Windows activation methods. For instance, the Online KMS method requires connecting to a fake KMS server approximately every six months to renew activation. The introduction of mandatory TPM attestation could potentially render this method unworkable, as fake servers would be unable to pass hardware verification.
At the same time, the ultimate impact of the new technology on the piracy activation market remains an open question. Recently, Massgrave developers introduced a new method called TSforge, which they claim can bypass the entire Microsoft DRM architecture used for software activation. How effective Microsoft's countermeasures will be after the implementation of mandatory TPM attestation will become clear once corporate customers begin transitioning to the new system in 2026.