Depending on what you were licensed for, this likely may translate to licenses for ZD&T Personal Edition. RVU and Enterprise Editions are really add ons to this as far as software goes. You do NOT have to move to software based licenses. I have a zD&T v12 box with a USB hardware key.
RLKS, or Rational License Key server is a software product that handles multiple software product license types for IBM. Most shops put the RLKS on its own VM. The OS needs to be either RHEL or Suse (althought I've installed it on OpenSuse before).
Kenny Smith