Hi @bizcntradmin ,
The SQL Server license is covered here in System Center licensing guide, it covers Configuration Manager CB as well.
"No additional licenses are needed for the management server or SQL Server runtime (SQL Server Standard Edition). "
Note: The SQL server must be standard edition and cannot be used for anything else that System Center products and WSUS used by SCCM for instance.
From the official Microsoft documentation:
What are the use rights associated with the SQL Server technology provided with Configuration Manager?
Configuration Manager includes SQL Server technology. Microsoft's licensing terms for this product allows your use of SQL Server technology only to support Configuration Manager components. SQL Server client access licenses are not required for that use.
Reference:
https://learn.microsoft.com/en-us/mem/configmgr/core/understand/product-and-licensing-faq#bkmk_sql
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Best regards,
Leon