Hello,
Symantec Endpoint Protection 12.1 license works per computer machine basis.
A license lets you install the Symantec Endpoint Protection client on a specified number of computers. A license lets you download virus definitions, security content, and product updates from LiveUpdate.
In your case, check this Article:
How to manage license file when there are several Symantec Endpoint Protection Managers in place?
http://www.symantec.com/docs/TECH164392
You could contact the Licensing Department via:
Website: http://symantec.custhelp.com
Phone number: 1-800-721-3934
Email: license@symantec.com
https://licensing.symantec.com/acctmgmt/index.jsp
For Renewals or view details of your Symantec support contracts visit our License Renewal Center.
Hope that helps!!