Hello,
Could you please let us know the version you are carrying?
Is that Symantec Antivirus Corporate Edition 10.2 or 10.1?
I think Symantec Antivirus Corporate edition 10.2 doesn't need any license file to activate it. It has only a paper license.
Plus, it is definitelty time to start migrating to SEP. SAV 10.1 is still currently supported, but only until July 2012. SAV 10.x and SCS 3.x entered End of Life on January 4, 2010, meaning the 30-month Standard Support window will end July 4, 2012. After that date, AV definitions may no longer be available at all for SAV.
http://www.symantec.com/theme.jsp?themeid=eol_av_ce&depthpath=0
http://www.symantec.com/business/support/index?page=content&id=TECH178551
Hope that helps!!