Microsoft announce some expanded use rights for the Azure Hybrid Benefit with SQL Server giving additional flexibility in using Standard and Enterprise Core licences for Azure IaaS and PaaS solutions.
SQL Server Standard Core licences may now be used for SQL Server Enterprise virtual machines with 4 Core licences required for each virtual core, and SQL Server Enterprise Core licences may now be used for SQL Server Standard virtual machines with 1 Core licence covering 4 virtual cores.
There are similar changes for the licence requirements for the Azure Data Factory SQL Server Integration Services Standard/Enterprise, and SQL Server Standard Core licences may now also be used for Azure SQL Database Business Critical solutions with a requirement of 4 Core licences to cover a virtual core.
You can find the announcement article here: https://bit.ly/2PlP6oh and find the official documentation on pages 54/55 of the August 2020 Product Terms document: http://bit.ly/MSproductterms.