The problems emerged with Assassins Creed II, a new game from the company. On Monday, Ubisoft Tweeted an apology to those players who were not able to play the game on Sunday. It said that Ubisoft servers were attacked, limiting service for 6 ½ hours.

However, the day before, Ubisoft's UK community manager said that the company was experiencing difficulties with its online service platform because of excessive demand.

Ubisoft's digital rights management system forces PCs to connect to the Internet when running its game software, even when customers are playing single-player games that do not need network connectivity to multiplayer servers.

"My Internet is working perfectly fine, but I still get this error upon launch: 'an Internet connection is required to play this game. Failed to connect to the Ubisoft master servers. Please verify that your Internet connection is functional and try again' ", said one irate customer on the Ubisoft gaming forums.

"Please remove DRM from your games so I can be your customer can," said another gamer. "Let this failure of your DRM be a lesson. You could try adding nonessential features to your games that require a login from the manual."

This is not the first time that Ubisoft has come under fire for its DRM practices. In summer 2008, it was blasted by customers for an issue concerning CD check that enabled people to play its Rainbow Six Vegas 2 title. Users downloading the game from an official source didn't have a disk, making it impossible for them to play the game. Reports suggested that a patch for the problem distributed by the company came from a warez group.