Hi,
It's possible.
SEP 11.x licensing is basically just a "paper" license product. However, with SEP 12.1 the licensing is a "software" license product and uses a license file.
Depending upon the license vendor, you receive either a product license serial number or a Symantec License file. License files are either sent to you in email or downloaded from a secure Web site. The license file uses the file extension .SLF (Symantec license file ). When the license file is sent by email, it is attached to the email as a .ZIP file. You must extract the .SLF file from the .ZIP file.
Check this article to know more about licensing:
https://www-secure.symantec.com/connect/articles/sep-121-and-license-concept