[stonemetal]

Unfortunately no Steam uses its own package format, so it must run the installer the first time to get steam to unpack it. Steam provides DRM but it is up to the author of the game to use it, their own, or none as they see fit. And no Steam doesn't provide any clues as to what DRM is used by a game.

[endianswap]

Some games have third-party DRM listed, but I have no idea if most games with such DRM are detailed in this fashion:

http://store.steampowered.com/app/35140/ 3rd-party DRM: SecuROM™ 4 machine activation limit

[stonemetal]

It seems like I have run across other games that use secuROM but don't mention it. I don't know if it was because that was before they added the listing or because there was no restriction like the activation limit.