Those playing Assassin's Creed 2 on the PC got a rude reminder of DRM's pitfalls when the servers that authenticate the game went down. Many complained on the company's official forum, and tempers ran hot. Remember: the game has to be in contact with Ubisoft's servers to work; if the connection is lost, the game shuts down.

Ars Technica contacted Ubisoft to ask about the issue, and we were told that the issue wasn't simply a server malfunction. "This 'failure' was due to a massive DDoS attack on our servers," an Ubisoft spokesperson told Ars. "Our servers didn't go down but 5 percent of the overall people attempting to connect received denial of service errors. This is, of course, unacceptable and our teams are working around the clock to ensure it doesn't happen again."

The issue of pirates playing the game also gets short shrift. "Neither Assassin's Creed II nor Silent Hunter 5 are cracked at the time we speak. As mentioned previously, 'cracked' versions are incomplete... as in missing whole parts of the game and crucial features," the spokesperson continued. That means that with just the data from the disc or your download, you won't be able to play the game. The content requires whatever the Ubisoft servers are giving it.

Ubisoft leaves us all with a reminder that no matter how intrusive or failure-prone it is, DRM isn't going away. "We worry about our customers and apologize to anyone who couldn’t play ACII or SH5 yesterday. All in all, we hope people understand all this is done to preserve the future of PC gaming."