To license individual VMs using the Per Core model, customers must purchase a core license for each v-core (or virtual processor, virtual CPU, virtual thread) allocated to the VM, subject to a four core license minimum per VM.
Please refer to Page 9 to Page 12 of the SQL Server 2014 Licensing Guide for more details.
And if you have any question about the license issue, you can speak directly to a Microsoft licensing specialist as Olaf mentioned. For international customers, please use the https://www.microsoft.com/en-us/licensing/worldwide to find contact information in your locations. For Volume Licensing Service Support, please use the https://learn.microsoft.com/en-us/licensing/contact-us to contact information for your country.
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