InsaneTek

Ubisoft will be moving their DRM servers starting on February 7, meaning that some games will become completely unplayable during the down time. There are only a few games that will be completely unplayable. Most games will just lose their online content for a while, but offline-mode will work as it should. Following is a list of games that won't be affected and a list of games that will be completely unplayable. 

Games that won't be affected:

• Anno 2070™ for the PC
• Assassin’s Creed® Revelations for ONLIVE
• Assassin’s Creed® Revelations for the PC
• Assassin’s Creed® Revelations for the PS3
• Assassin’s Creed® Revelations for the X360
• Driver® San Francisco for the PC
• Driver® San Francisco for ONLIVE
• Driver® San Francisco for the PS3
• Driver® San Francisco for the X360
• Just Dance ® 3 for the X360
• The Settlers ® Online (PC web-based)

 Games that won't be playable at all:

• ASSASSIN'S CREED ® for MAC
• Tom Clancy’s H.A.W.X.® 2 for the PC
• Might & Magic : Heroes VI for the PC
• Splinter Cell Conviction® for MAC
• The Settlers 7: Paths to a Kingdom™ for the PC
• The Settlers ® for MAC

All other games lose online services but offline playing of the game will remain the same. You can read the announcement here.