You will need KEY to apply
Cisco may chime in with the correct course of action but
E-Mail licensing@cisco.com
You need to include
You Support Contract ##
very important
DEMO
or
HOSTNAME (if replacing existing 5.31 with 6.X)
I would include what you are currently licensed for to be sure.
There may be more information depending on your request.
I thin you can also open up Cisco TAC cases as well for license issues and new licenses
http://www.cisco.com/techsupport/servicerequest
Mobile Tools for Support cases
https://supportforums.cisco.com/community/netpro/online-tools/mobile-technical-support