you have to mark them hacked somewhere I think.
As for what you should get registered or not, that's up to you. I would say all the regular programs (analyse, browse, edit,...) buy them registered. They're not illegal, so that shouldn't be much of a problem. As for the hacking programs, it depends. As the rolls to patch them have an interval of 1 week, you can only patch 4 programs per month yourself. So if you want to have them all not registered, get a warez group contact so you have help with the patching (each person takes 1 or 2 programs, which should be doable).