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When buying a version of Windows Server 2012 R2, you will install a server license that entitles you to the operating system on a server. Each device is connected to the server, a separate device license, also Device CAL.
Each device requires its own Windows 2012 R2 User CAL
Windows Server 2012 R2 Device CALs (Client Access Licenses) gives the right to the holders of the controlled devices to connect to the server and access the data stored there. Unlike user CALs, also called user licenses, Device CALs for Windows Server 2012 R2 are bound to a specific device and not to a user. There are no individual access for each user, but per device. With Windows Server 2012 R2 Device CALs from a recognized computer you have access to any employee of the server. This model is particularly suitable for companies where there are permanent workplaces where sometimes other employees need access to the server.
Connect all devices easily with the server
How many Windows Server 2012 R2 Device CALs you need to buy depends on how many devices need access a server. This package contains 10 Device CALs. You can extend your Windows Server 2012 R2 Device CALs random and thus provide access to the server from any device in your company. Adjust the required amount of CALs exactly to your needs and work cost-efficiently and economical. Note: Device CALs and User CALs can be combined, but cannot be split. They are always bound to the aimed purpose.
Windows 2012 R2 Device CALs can be used for, Windows Server 2012 R2 Standard and also for Windows Server 2012 R2 Datacenter. Moreover, the user CALs are backward compatible, so it can be used for older operating systems.
Windows Server 2012 R2 - 10 Device CALs - System requirements