Terminal Services CALs

[gdstaring]

I know that terminal service CALs are a per seat license, either per-user or per-device. However, I need to know if that applies to simultaneous users or if a CAL is used because a user has logged in in the past. For instance, if i have 50 CALs and 20 users have used the remote access in the past does that mean that I only have 30 CALs left or 50 because they are not currently using terminal services?

 

[root]

these licenses are for concurrent connections.

i.e you have 30 licences, 60 people can use the software/connections etc, just not all at the same time.