Personally, it's DRM if it's intrusive/invasive/restrictive in an unreasonable way. Requiring the disc to be in the drive is not DRM to me, whereas software installed onto your computer that you cannot uninstall, or not easily uninstall, is. If it requires online activation or connection at any time, that also counts. If it requires downloads or updates to become usable, that counts. CD keys are a little annoying, but they're not DRM and not a big deal, to me. I would like it if games, on the case or in the description, would tell you up front: "Disc check," or "CD Key Required," or just up front "Securom." That way, I know what I'm getting into from the start, especially from companies who don't have a standard form of DRM, like I think that newer Stronghold games have either Steam or Securom but the Stronghold Collection has nothing, it even says it on the box. Kinda sad that the rule is, unless specified otherwise, expect DRM of some kind (generally intrusive). It's been forever since I've gotten new retail games on PC, maybe it's not the norm anymore.