[Update: Ubisoft revealed last week that the keys in question were purchased with a stolen credit card, but in spite of that it has decided to reactivate some of them. "After further investigation into the matter of keys that were fraudulently purchased on EA's Origin store, we are reinstating keys for consumers who already had successfully activated and started playing the games," a Ubisoft rep told GameInformer. "Any remaining fraudulently obtained and resold keys have been deactivated."
The rep said that Ubisoft will maintain its policy of deactivating fraudulent game keys in the future, however, and strongly recommended that gamers only purchase game keys "from the Uplay shop or trusted retailers."]
http://www.pcgamer.com/ubisoft-says-canceled-uplay-game-keys-were-fraudulent/
Seems they can't make their mind up with this.