Terminal Services CAL
The Terminal Services functionality is included with the acquisition of a
Windows Server 2008 Server License. However, when a user or device accesses a
terminal server, that user or device is required to have a TS CAL (in addition
to a Windows CAL) in order to be compliant with the licensing terms of the
product. A separate TS CAL is required for each user or device that accesses or
uses the server software on any server.
Device CAL
A Device CAL permits one device (used by any user) to access or use the server
software. Device CALs are likely to be more cost-effective than User CALs if
there are multiple users per device (for example, a call center or an airport
kiosk).
Maintenance
Software Assurance (SA) is Microsoft's maintenance program that provides product
support, software upgrades, and more.