vlmcsd is a fully Microsoft compatible KMS server that provides product activation services to clients. It is meant as a drop-in replacement for a Microsoft KMS server (Windows computer with KMS key entered). It currently supports KMS protocol versions 4, 5 and 6.
vlmcsd is designed to run on POSIX compatible operating systens. It only requires a basic C library with a BSD-style sockets API and either `fork` or `pthreads`. That allows it to run on most embedded systems like routers, NASes, mobile phones, tablets, TVs, settop boxes, etc. Some efforts have been made that it also runs on Windows.