Soooo, DRM, how many layers? Cause I've read these lines on the announcement
Other requirements: Installation and online play requires log-in to Rockstar Games Social Club (13+) network; internet connection required for activation, online play, and periodic entitlement verification; software installations required including Rockstar Games Social Club platform, DirectX, Chromium, and Microsoft Visual C++ 2008 sp1 Redistributable Package, and authentication software that recognizes certain hardware attributes for entitlement, digital rights management, system, and other support purposes. Single use serial code registration via internet required; registration is limited to one Rockstar Games Social Club Account (13+) per serial code; only one log-in allowed per Social Club account at any time; serial code(s) are non-transferable once used; Social Club accounts are non-transferrable.
and in addition to R* Social, I can think of Steam for serial code registration, but the 'periodic entitlement verification' sounds like an extra phone-home system...