It isn't officially affiliated with any publishers.
Edit:
Rebellion posted a list of digital retailers it sends Sniper Elite 3 keys to. If the store you're eyeing isn't listed, there's a good chance it's just reselling retail keys.
That's the problem for both customers and publishers. That list doesn't even start to cover stores selling legit, publisher delivered digital games. Right away I can say it's missing at least five different legit Finnish stores. Stores, that the publisher might not have even heard of, because the keys go through affiliates.
I can probably figure out if a local site is legit or not just by reputation and with whom they are associated with (and general knowledge of the Internet), but most people probably wouldn't know any better between a legit site, and a cd key site that happens to NOT have a name like "cdkeyshere.com" (also, most people don't care either way). It's becoming even harder to figure out between a legit and non-legit site because there are now properly localized (ie. in this case in Finnish) cd key sites. Sure, some sites use poor google translations, but there are very professionally translated sites also.
