Android versions without DRM?
Paid Apps are tied to an Google account. But this is because of the Google Framework and not because of Android. No one needs to "remove DRM from Android" because there is no DRM within Android. Only support for it. If you install free (as in beer) Apps, everyone can use them.

There is only one imitative that goes one step further then being DRM-less: Android FOSS Apps @ http://f-droid.org/