Hi,
Thank you for posting in Symantec community.
I would be glad to answer your query.
Check the following articles:
Licensing Symantec Endpoint Protection
http://www.symantec.com/docs/HOWTO55056
Purchasing licenses
http://www.symantec.com/docs/HOWTO55072
Where to buy a Symantec product license
http://www.symantec.com/docs/HOWTO55298
Product license requirements
http://www.symantec.com/docs/HOWTO55074
Contact Us
http://www.symantec.com/partners/support/contact-us.jsp
Assistant & Information
http://www.symantec.com/support/assistance_information.jsp
Forum Article "SEP 12.1 and License Concept" will give more insight about SEP 12.1 license concept
https://www-secure.symantec.com/connect/articles/sep-121-and-license-concept