nope An Ubisoft representative updated a forum post to say that "it's a problem that occurs when linking your keys to the multiplayer profile. Ubisoft GNS and TG-OPS are currently working on a solution."
Assassin's Creed II PC and Silent Hunter 5 PC both had downtime for legitimate customers after repeated denial of service attacks were made against Ubisoft's authentication servers. Ubisoft maintains that the DRM scheme has not been cracked.
Meanwhile, Eurogamer has learned that the delay hitting the PC version of Splinter Cell: Conviction, which releases 2 weeks after the Xbox 360 version and will use the same DRM scheme, is to polish the game and not due to its DRM.