My apologies if this has been answered already; I did do a search beforehand...
I do understand that GoG's games (are said to*) have no DRM, but do they dynamically embed user information into the installers, like how Apple has chosen to do with their 'DRM-free' audio tracks? (The reason for such being possible identification of and access restriction for users that let their files out into the wild...)
Put another way, will two different users' installers for the same game end up with the same checksum?
Just wondering, as this may affect my future purchases here...
Thanks in advance all!

I'm not sure why this would be an issue, unless you intend on being a pirate and/or uploading them to a torrent site. And shame on you if you do that. Seriously.
But I honestly doubt GOG would do that (and if they did, they probably wouldn't want to tell you).
*waits for GOG memeber of staff to prove me wrong somewhere >_> *

in the past the md5 checksums were posted in each forum so you could check the game to see if it downloaded alright.
Nowadays the checksum is checked by the installer itself.
The first thing of public checksum would indicate that at least in the initial design there is no room for embeding user info in the installer.

Since the checksums of several of the installers have been posted in the relevant forums, I think it's safe to say that everyone gets exactly the same file.
GOG chooses to trust its customers, rather than treat them like criminals. So far, noone has betrayed that trust. Hopefully, noone ever will.

There's no DRM or digital signing of any kind that's specific to your account. you just download and install on any machine.. even machines running wine or parallels or whatever.

I've already seen a GOG release (with the GOG installer) on a torrent site, and I was really angry about it.
When you see the prices here and the DRM-free policy, I don't even know why someone could want to illegaly download a GOG release.
And I'm more angry against the GOG user who throw a game in the torrents...

bring the gas, take the guns, bring cross and rope and torches, lets find this infidel

Yes whoever has put a gog file on a torrent site needs shot it does nothing but damage the service if the games are put on torrent sites.
I for one want to see gog thrive and grow and the fact they put their trust in us with no drm is amazing that to have someone break their trust annoys the hell out of me.

I've checked torrent sites for GOG releases in the past and never found one. The fact that someone has torrented one now is, in the words of Daffy Duck, "dithpickable!" :-(

Were you looking for GOG releases on torrent sites?

In fact, I was searching for Duke Nukem mods and extensions, when I've seen a Duke Nukem Atomic pack. No "GOG" reference on the torrent title. But just by curiosity, I've checked the torrent file list, and it was indeed (sadly...) the GOG version.

"GOG chooses to trust its customers, rather than treat them like criminals. So far, noone has betrayed that trust. Hopefully, noone ever will."
So true. I was so close to burning my copy of Spore GALACTIC EDITION when I learnt that the pirates had an easier time with their copy than I did

Maybe we can contact the torrent uploader and kindly ask him/her to remove that torrent, because this one is different from the other torrents s/he has. It could work.