For software protection, FLStudio requires a regkey file that is downloaded from the Image Line store.
I read on another thread a while back that the reason you won't find sections devoted to FLStudio in say, Sound on Sound magazine, is because the first release was for your average Joe user instead of professional users/studios. It has come a long way since then and is a powerful enough DAW that personal preference and ability are the decisive limitations when comparing or choosing one over the other. Despite this, it remains on the fringe in professional audio production culture (that I have seen anyway) If one of the big music corporations acquired Image-Line and FLStudio, I am positive that would change.
I haven't used Cubase so I can't say how it compares but:
-I have heard that FLStudio is the best suited DAW for automation. You can automate like everything.
-FLstudio is very condusive to, well, loops. And sequencing. I don't know how easy it is to make a generic techno track in Cubase, but FL almost pushes you into it. It is very friendly toward anything beat driven.
-FLstudio offers Free lifetime upgrades of the version you purchased. FL8 basic -> FL9 basic is free for example. If you want to step up from basic to XXL you may do so for the current price difference I believe.
Hope it is helpful.