The Microsoft Core Infrastructure Suite Standard server is licensed based on cores and supports two virtual machines.
This CIS Standard version includes:

Windows Server 2019 Standard Edition
System Center 2016 Standard Edition 

Information on the licencing:
Since Windows Server 2016 Microsoft has changed its licence model – it has been changed from the “per processor licencing” to the “per core licencing”.
This means: All physical cores of a server need a core licence. Please note in this respect:

For each processor, a minimum of 8 core licences is required
For each server, a minimum of 16 core licences is required
The core licences are exclusively sold in double packages

Language(s): German, other European languages are available upon request
Scope of supply: MAK activation key, licence data, download link to the installation file 
Submission of the activation key/Installation files/Product activation: After the completion of the purchase and a