timppu: I agree it can be that (depending on the game and how it is integrated with running the game), but I think that is exactly what I was referring to with "what the client is requiring you to do".
Timboli: Mmmm I don't know, I think it is splitting hairs.
I don't agree it is splitting hairs, as some claim the mere existence of the Steam client means all Steam games have DRM, hence can't be considered DRM-free. I just find that argument completely wrong. There are
games on Steam that are completely DRM-free. I bolded up the important part there,
games, because I hope that is what we are talking about, not e.g. the service or tool you use to download your game.
Timboli: If the client is required, it is part of the DRM setup, so essentially one of the DRM ingredients, so at least partially DRM in itself. If it wasn't required, I could agree with you.
As I mentioned with my DEFCON example, a separate client is not needed for DRM. I wouldn't be surprised DEFCON Steam version is similar to GOG version, ie. it can be played without the client, but still the multiplayer has that DRM where it checks that you are not using the same multiplayer key as the other players in the game.
There are lots of other Steam games too where the, at least main, DRM seems to be elsewhere than with the Steam client. For instance Geometry Dash, I think it makes you connect from within the game to the game publisher's service, to play the game.
So to answer your question (ok it wasn't really a question, but whatever), the Steam client is not needed for the DRM in Steam games. It can optionally used for that DRM as well, along with lots of other choices. It is optional for DRM.
Timboli: Even if just needing the client to download a game, it is a degree of DRM. As it is managing your digital rights for you.
I've used several pages and hours of my precious life to explain, why I find that argument totally wrong.
It is like claiming that buying a vacuum cleaner from a store where they say the only option to deliver it to you is UPS, is DRM. So the vacuum cleaner is not DRM-free because the store puts some arbitrary restrictions on the delivery?
We can agree to disagree, but I still haven't found any good argument to convince me that the delivery part of the goods can be considered "DRM", if it doesn't affect you in any way after you have the goods and how you can use it, be it a vacuum cleaner or a digital game from a digital gaming store.
It is a similar flawed argument as to claim that all GOG games have DRM because GOG checks whether you have purchased the game before you can download it, as then they are "digitally managing your downloading rights". Or that how GOG offers only certain ways to pay for your purchases, excluding e.g. using Bitcoins or other crypto currencies for payment, and that somehow makes GOG game DRM-games.
We should be concentrating on how the store is "digitally managing your rights" when you are actually using, ie. playing (and installing on a new computer) the game, not when you are purchasing or downloading the game.
Timboli: GOG on the other hand, offer you three different ways to download your bought game from them.
1. Galaxy.
2. Browser Links.
3. GOG API ... with some scripting or third party program.
Yes, it is
convenient that GOG offers several methods for the goods delivery, also using commonly available tools and clients like web browsers, because it grants me several choices how and where to get my GOG games. Like, with my Raspberry Pi4 computer, a library computer (where I can't install any software of my own, like Galaxy or Steam), or even a mere Android tablet.
Yet, it still has nothing to do with whether the game is DRM-free or not. It is just more convenient that GOG offers those choices, and also that the GOG installers are self-contained and easy to archive.
(Still, as said, I would actually probably prefer if GOG offered the "offline installers" as mere .zip files that you decompress somewhere and then just play, and removing the game is as simple as just deleting that game sub folder...)