jbunniii: Of course it's DRM. Consider what happens if I want to buy a game that my wife and I can play at the same time.
1) Steam: must buy two copies
2) GOG: one copy suffices
3) physical copy: (usually) one copy suffices, with a bit of CD shuffling hassle at startup
Steam is clearly inferior from that standpoint, except when the sale price is so low that buying two copies from Steam is cheaper than getting it elsewhere. (It happens!)
From a publishers standpoint you're wife hasn't purchased the right to play it.
A fairer example is that i have 3 computers and the right to play for example civ4, so why shouldn't i be able to play a round robin game by myself utilizing all three of my computers to enjoy the one game i have the RIGHT to enjoy. I also play Diablo II using 2 computers at once because the characters in it quite simply put are geared towards skill assists, therefore making the game itself based around multiplay.
Yes the publisher has rights over the intellectual property, but the publisher has NO RIGHTS over my property and in that, though it can be argued that software can be patented because it physically creates a product by augmenting and changing the physical hard disk it does not actually give companies said RIGHTS over what they do not own (my hard drive).
Should i be forced to unnecessarily AUGMENT MY HARDRIVE with a 3rd party application such as a subscriber agent when that is not in fact WHAT i have paid money for regardless of how 'safe' the company asserts it to be (as not being the issue here)?
The answer is no it is there because the company fears piracy and will not give you the choice to seperate the products from one anouther and get exactly what you are paying for and only what you were paying for; thus being a form of digital abuse akin to a trojan or other malware device.
Is it DRM? this hinges on it's necessity, it's transparency in being seperate yet bundled and lastly wether it is restrictive in any way shape or form on HOW you use the digital content which you have legally purchased the right to enjoy.
Steam strikes out on all three and is to be considered DRM.