gforcefan: 1) Disc Check only. So long as you run as an admin (which you should)
Which you
shouldn't, if you're interested in using your computer in a safer way. If you get a virus as an administrator, it has full reign on your computer. As a limited user, it can't get nearly as far.
A "simple disc check" should not install
anything onto your computer or try to examine any software you are running. The SecuROM version on the Fallout 3 disc does, as it complained about me running Process Explorer, which I always run as it is more precise than the Task Manager, and put a known SecuROM DLL into my system32 directory.
gforcefan: 2) Daemon tools, Nero, etc can be installed. Some people, such as Dr.Colossus report they can even be running while playing.
Newer versions that have ways around the SecuROM checks, or newer versions that SecuROM doesn't know to or try to check, sure, they can be installed and be running without a problem. Older versions, especially in the case of bought software like Nero, which is not cheap and never broke the older versions, will get caught and prevent the game from installing/running, even if that software is uninstalled before trying again.
gforcefan: 3) Disc Check can be bypassed by linking directly to the .exe instead of the launcher (this will probably be patched out).
I tried running the Fallout3.exe from the install directory directly after installing from the disc, because I heard this. It still tried calling back to the launcher and ended up having the exact same issue on my computer.
gforcefan: I hate any DRM, but as far as it goes, this is about the least invasive as you can get. So don't dissuade people from buying this game over a non-issue.
It's not a non-issue if a piece of software intentionally denies you use of something you purchased, especially when it denies you off of a false positive.
I will agree that this is not the worse type of DRM. There is obviously much, much worse DRM out there (just look at 2K Games and EA), but there is still a better way. It's just a matter of finding it.