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The following types of RDS Server Client Access Licenses are available:
-RDS Device CAL: Permits one device (used by any user) to use Remote Desktop Services functionality on any of your servers.
-RDS User CAL: Permits one user (using any device) to use Remote Desktop Services functionality on any of your servers.
-RDS External Connector: Permits multiple external users to access a single Remote Desktop server. If you have multiple servers, you need multiple external connectors in addition to any required Windows Server External Connectors.
You may choose to combine RDS Device CALs and RDS User CALs simultaneously with the server software. You may permanently reassign your device CAL from one device to another or your user CAL from one user to another. You may temporarily reassign your device CAL to a loaner device while the first device is out of service, or reassign your user CAL to a temporary worker while the worker is absent.
RDS Technologies Requiring RDS CALs:
Microsoft licensing policies for Windows Server Remote Desktop Services (including the components that are included in Windows Server 2008, Windows Server 2008 R2, and Windows Server 2012) require that, in addition to a Windows Server Client Access License, Microsoft Core CAL Suite, or Microsoft Enterprise CAL Suite, you must acquire a Windows Server 2012 RDS CAL for each user or device that directly or indirectly accesses the server software to interact with a remote graphical user interface (GUI) (using the Windows Server 2012 Remote Desktop Services functionality or other technology).
Remote Desktop Services functionality is defined as those features or services that are running when enabling the Remote Desktop Services role and/or role service(s) in Windows Server 2008, Windows Server 2008 R2, or Windows Server 2012. This includes but is not limited to Remote Desktop Gateway, RemoteApp network software, Remote Desktop Web Access, Remote Desktop Connection broker, Remote Desktop session host, Remote Desktop Virtualization host, and RemoteFX.
Note: No RDS CALs are required for up to two users to access instances of the server software for administration purposes.
Remote Desktop Services:
Microsoft Remote Desktop Services is a centralized desktop and application platform solution that uses desktop virtualization technologies to deliver and manage corporate desktops in a more flexible way. RDS reflects the expanded role in Windows Server 2012, which is that desktop or applications can run in the data center while users can access them from anywhere.