vlmcsd
KMS Emulator in C (currently runs on Linux including Android, FreeBSD, Solaris, Minix, Mac OS, iOS, Windows with or without Cygwin)
A KMS server emulator written in C that activates Windows and Office on local networks, running on Linux, macOS, Android, Windows, and many other operating systems.
vlmcsd is a KMS emulator written in C. KMS stands for Key Management Service, which is a protocol Microsoft uses to activate Windows and Office on networks of machines. This project provides a server that speaks the same protocol, and according to its description it runs on a wide range of operating systems: Linux, Android, FreeBSD, Solaris, Minix, macOS, iOS, and Windows, with or without the Cygwin compatibility layer.
The repository README itself is nearly empty. It only directs readers to view the documentation through man pages included in the distribution, or alternatively through text, HTML, or PDF files in the man directory. No build instructions, usage examples, or feature descriptions are provided in the README itself.
Given the sparse README, most of what can be said about this project comes from its description and the presence of man pages. The two main components appear to be vlmcsd (the server) and vlmcs (a client tool), each with their own man page. Anyone looking for detailed documentation would need to consult those files directly.
Where it fits
- Run a self-hosted KMS activation server on a home lab or corporate network to activate Windows and Office installations.
- Test KMS client behavior against a local server without contacting Microsoft's activation infrastructure.
- Deploy a lightweight activation service on an embedded Linux device or Android machine.