The datacenter I rent from tells me I can get a SPLA key and input it into the windows server OS and that will stop me from having to rent the OS from them while not having to reinstall windows. The above link gets you microsoft support for Win server,edit the L. According to this page, SPLA is for service providers like the one you rent from. They use SPLA licenses that allow them to rent out the systems to end users you.
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Microsoft Windows Server 2012 Add-on Device CAL Open Government | R18-04292
If you ordered before Windows Server , an operating system easy to install and manage. Windows Server DataCenter is the version intended for companies of equal importance, for small and medium entreprises that give priority to virtualization and a hybrid cloud environment. With the new user interface and its many programs and features, have a complete view of your infrastructure.
Microsoft Windows Server Add-on User CAL Open Business | R18-04281
Your question might be answered by sellers, manufacturers, or customers who bought this product. Please make sure that you are posting in the form of a question. Please enter a question. Larger companies that have invested in heavy virtualization and want to maximize their operational scale and performance. Provide secure remote access to your mobile workers and automatic VPN connections to enable your users to sync their work files from a corporate server to their devices.