Ubisoft garnered quite a bit of hate from PC gamers last year when all their new releases came with a new Digital Rights Management system that prevented you from playing your game if you didn't have a constant internet connection. The reason this caused so much controversy is because this system applied even if you were playing a game that was exclusively single player. There were occasions where the DRM servers went down and nobody was able to play any of Ubisoft's PC games that used the system, including the PC versions of Splinter Cell: Conviction and Assassin's Creed 2.
Even though last month Ubisoft scaled back some of its DRM on last year's games, there were still some initial worries that Assassin's Creed: Brotherhood would be using this same DRM system. Ubisoft has confirmed that the game's Single Player campaign would be playable offline, although it would require an initial login process.
The PC version of Assassin's Creed: Brotherhood comes out on March 22nd and it will be available in two editions. The standard edition costs $50 and comes with the two DLC multiplayer maps, "The Da Vinci Disappearance" single player DLC, some extra characters for multiplayer and two more single player levels.