Egads, that's a political hotbutton there.
I'm not sure I want to touch that with a 10' pole.
Well, ok, I'll try.
Essentially, Kenzer got an official license as an agreement for them not to sue WoTC. Why would they sue WoTC? Over the Dragon Magazine CD Archive. See, when WoTC sold the Dragon Magazine CD Archive there was no contractual agreement between the publishers of Dragon (TSR/WoTC) regarding possible future royalties of possible future releases of the magazine. That is, if you submitted content to Dragon, you agreed to receive payment for your work, and that was it. No one had the foresight regarding putting the magazine on CD and selling them *a second time*. Kenzer threatened to sue WoTC over WoTC's republishing content - specifically KotDT comics in the issues on the CDs.
That's why Kenzer stuf is "official". To call it official is quite a bit of a stretch really. It's just a word. Like "organic" or "all-natural". It really doesn't mean crap.
What's official in my game is what I allow, and nothing more. Period.
Could Kenzer produce their own magazine? Sure, they could. So could you. So could I.
Would it be "official"? No freaking way.