When you purchase a Windows Server 2012 you acquire a server license, which entitles you to install the operating system to a computer. Anyway you need to buy more licenses for your employees to have full access to the server. This is achieved by user licenses, known as user CALs.
Each server user requires a separate Windows 2012 User CAL
Windows Server 2012 User CALs (Client Access Licenses) make it possible to connect individual users with a Windows Server operating system. To make your Windows Server 2012 operating system available for many users, you must have the appropriate Windows Server 2012 User CALs. To enable the connection with the server system for each user, another client access license must be verified. Then the user has the full access to all content and services of the server system, which are enabled by the administrator.
Easy access by individual access
Unlike Device CALs, also licenses device, User CALs 2012 are bound to the Windows server to a specific user. The user gets individual access to the server and can use it in any workplace. User CALs are not bound to a specific device. They are suitable particularly if your employees are using multiple devices, such as a desktop PC and a laptop. Each user has Windows Server 2012 user CALs full access from each device to the server. User licenses make the job so much more flexible and allows easy and fast access to relevant data.
Connect easily all employees to the server
How many Windows Server 2012 User CALs you need depends on how many workers need the access to the server. This package contains 10 User CALs for 10 users providing them access to the server. You can freely expand your Windows Server 2012 User CALs and thereby providing access to the server to all your employees. Adjust the required number of CALs to your needs and work efficiently. Note: User CALs and devices CALs can be combined, but not split. They are always bound to the aimed purpose. Windows 2012 User CAL can be used for Windows Server 2012 Standard and Windows Server 2012 Datacenter. Moreover, the user CALs are backward compatible, so that they can also be used for older operating systems.
Windows Server 2012 - 10 User CALs - System requirements