I have, and have been using for some years a copy of Framemaker 8. Following a disk crash I got a new PC, and tried to install Framemker. When entering the serial number, it complains that it is already installed on two other computers. It isn't!
It was "installed" on the broken PC, and may well have been installed on a previous one when that bit the dust, but I have no active/useable copies of that Framamaker serial anywhere.