Windows Server Datacenter 2016 allows the installation of an unlimited number of virtual machines.
Language(s): Multilingual 
Scope of supply: Licence kit including media, original Product Key Card (PKC) with serial number and certificate of authenticity.
“ROK” stands for “Reseller Option Kit”. There is a BIOS lock for Lenovo server, but with the key you can activate each Windows Server Datacenter 2016 installation.
Submission of the activation key/installation files/activation of the product:
Dispatch of the licence package by post.
Installation valid for: 1 Server with up to 16 cores, unlimited virtual machines
Platform/Minimum requirements: 
1,4-GHz-64-bit processor with NX/DEP, SLAT, as well as Windows 8.1 and Windows 10 also the functions CMPXCHG16b, LAHF/SAHF, PrefetchW, 512 MB RAM, DVD drive (only for the installation of DVD media)
Further features:

New product, key not yet scratched off
Tested original software
Commercial full version (no Home or Stude