It is issued to organisations and it can be retired and inactivated if leaked, but I am not sure if it actually happens. This type of activation uses the same concept with the Retail key, only that it can used multiple times, typically 1500 times. There is a middle of the road solution named MAK activation meant to be used by the same users like those using internal KMS, but is designed to facilitate other types of users, less connected to a corporate server. After activation, this server becomes the master license server for the organisation's computers using KMS Client keys, which are public. The KMS Server license is activated in a similar way to a Retail or MAK key, with Microsoft online servers and is a one off operation. Note: A Microsoft KMS Server is a server licensed with a special key activated with Microsoft which can provide internal licenses to Windows and other Microsoft products like Office if they are installed on this server. Require permanent connection to this server at least every 180 days by default. GVLK which is targeting larger businesses and is activated with a Microsoft internal KMS server. This licensing model uses single key activated directly with Microsoft online servers and does not require permanent connection with those servers. Retail, mostly targeting the consumer category or very small businesses. Licensing on the other hand can be separated by: There are few other less mainstream products like Workstation Pro and others, again the same product like the main ones described above, with features enabled according to the license under which they function. There is another product named Education which is a tweaked version of either Enterprise or Pro but not a product by itself, except for the fact that it becomes a standalone product when licensed as such. Pro is in the middle which can be used by small business or consumer Power Users as intended, but it is used by larger businesses (not intended).

I think there are 2 different concepts here which interact up to a point, but are different in essence. One such product which I know is Windows Server 2016 but there are likely others. Click to expand.There are or have been Retail versions of business products which are not necessary licensed as GVLK.

Windows 10 business edition