I remember it by "hearsay", that you usually get an AIX license, when you buy an appropriate hardware.
Way back when we got new RS6000 boxes delivered, we got installation medias and the license papers for the AIX to run on them.
Because of this one could say, that the license for your box was transfered to you when you got it, but usually the machines are registered with the owners name with IBM.
I can not say, what is the appropriate way, but as Robin says, you might want to be a tad more careful with your doings and the publishing of them
DL'ing it by some torrent or warez site is for sure not the correct way to get hold of it.
The purpose of obtaining a license, is to be no thief - that's it.