Ubisoft is drm crazy. When there servers get ddosed the game will not work. 2 hacker groups are angry at PSN and xbox. So they keep ddosing them which affects uplay. Or something along that line.
http://arstechnica.com/security/2014/12/fbi-claimed-to-be-investigating-xbox-live-playstation-network-ddos-perps/
If ubisoft was not so worried about DRM you all would at least be able to play offline. If drm was disabled, you would be able to play.
DDOSing has been an ongoing war us gamer get caught in the middle of.
http://www.forbes.com/sites/insertcoin/2014/12/26/how-kim-dotcom-saved-christmas-from-the-lizard-squad/