Kingdoms contains Securom AFAIK. And that one has been classified as Malware.

Whether it is still the case when some anticipated patch is out, I dunno. There appear to be tools to remove Securom with, though but then Kingdoms won't work anymore or so the story goes. I, myself, don't know mainly because:
1) I haven't played M2TW-K yet.
2) I haven't bothered to remove Securom et all yet.