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RDS Licensing
Assign a Licensing Server
Install RDS CALs on Server 2012 R2
Install Remote Desktop Licensing role
Control Panel → Administrative Tools → Remote Desktop Services → Remote Desktop License Manager → All Servers
Right-click your server name and choose Install Licenses
Click Next
Select your License Program (i.e. Service Provider License Agreement
)
Input your License Agreement Number (ours is 8 digits)
Product Version will be Windows Server 2012
License Type will be
RDS User CAL
Quantity will be the possible number of users