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A Windows Server 2012 Client Access License (CAL) is required for each user or device (or combination of both) that accesses or uses Windows Server 2012. This CAL may be used with the Standard or Datacenter editions of Windows Server 2012. (Note: Windows Server Foundation and Essentials editions do not require CALs for access; they come with 15 and 25 user accounts, respectively).
Licensing options let you choose the CALs that make economic sense for your network:
Device-based Client Access Licenses: Windows Device CALs might make the most economic and administrative sense if your organization has multiple users for one device - shift workers, for example.
User-based Client Access Licenses: Windows User CALs might make the most sense if your organization has many roaming employees who need access to the corporate network from unknown devices, or employees who access the network from multiple devices.
Please check the product name to determine whether this is a user or device CAL.
Windows Server 2012: Windows Server powers many of the worlds' largest datacenters, enables small businesses around the world, and delivers value to organizations of all sizes in between. Windows Server 2012 redefines the server category, delivering hundreds of new features and enhancements spanning virtualization, networking, storage, user experience, cloud computing, automation, and more. Simply put, Windows Server 2012 helps you transform your IT operations to reduce costs and deliver a whole new level of business value.