And forcing all multi-player games onto official servers where you can bet they verify accounts is not zero DRM either
It is not generally conssidered DRM to have an account and a password that you use to log on.
The term does not generally refer to other forms of
copy protection which can be circumvented without modifying the file or device, such as
serial numbers or
keyfiles
http://en.wikipedia.org/wiki/Digital_rights_management
Most people consider DRM to mean that the software or media is tied to the particular machine that it is run on, with some sort of recognition of the machine itself, so if you were to transfer it to another machine it would cease operation.
For example windows uses drm, since if you take an image of a windows volume and put it on another machine it will require reactivation. Same for a lot of the new games. They will only work for a particular machine if it is activated on that machine.
Im sure that you will be able to buy Elemental and run it on any machine, provided you have an impulse account. So in that sense it wont have DRM.