Terminal Services
Terminal Services is a function of Microsoft Windows that allows several types of connections to the server components of the system. Windows Server versions prior to 2003 do not necessarily require the use of specialized Terminal Services CALs; rather, clients which are of at least the same or lower version of the operating system are allowed access automatically. For example, Windows NT 4.0 clients may connect to Windows NT 4.0 terminal servers but not Windows 2000 or later; Windows 2000 or Windows XP clients may connect to Windows NT 4.0 or Windows 2000 terminal servers. This is called the equivalency license.
The system for enforcing the number of TS Cals ("Microsoft Enforced Licensing") used on versions later than NT was abused by the "FLAME" malware, leading to a patch in 2012 restricting the Certificate Creation system used for Terminal Services.
The number of per-user TS CALS on Windows 2008 is not enforced: supposedly, this was because Microsoft did not have time to finalize technical enforcement before the release of the operating system.
Read more about this topic: Client Access License
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