Windows Server 2012 Remote Desktop Services 5-User CAL
A 5-user Remote Desktop Services User Client Access License (CAL) permits five users, on any device, to use Remote Desktop Services functionality on any of your Windows Server 2012 installations.
Remote Desktop Services (formerly known as Terminal Services) in Windows Server 2012 enables users to connect to virtual desktops, Remote Application programs, and session-based desktops. With Remote Desktop Services, users can access remote connections from within a corporate network or from the Internet.
Windows Server 2012 requires that in addition to a Windows Server Client Access License (CAL), you must have a Windows Server 2012 RDS CAL for each user or device that directly or indirectly accesses any of the RDS functionality.