Oh noes...

http://www.1up.com/do/newsStory?cId=3178259

Following a span of a number of hours yesterday when owners of the PC version of Assassin's Creed 2 and Silent Hunter 5 couldn't play due to problems with Ubisoft's DRM authentication servers, the company now says the server problems were the result of hacker attacks -- attacks that are evidently still ongoing. As of this writing, Ubisoft's official Twitter account reports the DRM authentication servers are once again under attack, locking some gamers out of their perfectly legally owned games.
An earlier tweet on their account attributed yesterday's outage to hackers as well, saying "Servers were attacked which limited service from 2:30PM to 9:00PM Paris time [8:30AM to 3:00PM EST]." Now, a tweet that was posted about two hours (again, as of this writing) says that "Our servers are under attack again. Some gamers are experiencing trouble signing in. We're working on it and will keep you posted."

Yet another earlier tweet claimed that "95% of players were not affected" by yesterday's server outage, with only a "small group of players" receiving denial of service messages when trying to play Assassin' Creed 2 or Silent Hunter 5.

There's been a lot of anger from PC gamers over Ubisoft's new DRM system, which requires a constant online connection for authentication even while playing a single-player game like Assassin's Creed 2. Now with so many legal owners unable to play their legally-owned games because of a malfunctioning system to ward off pirates, one can only imagine those complaints are going to become a lot more heated.