Remember that Ubisoft banned a lot of Far Cry 4 keys? They will restore Far Cry 4 keys to players who had already downloaded and started playing the game before the keys were deactivated. So if you got the game and managed to play a little bit you’re lucky and you will get it back. More info available here.
“We are working with EA to prevent situations like this from happening again, and we will continue to deactivate keys that are found to be fraudulently obtained and resold,” Ubisoft said.
“We strongly recommend that players purchase keys and downloadable games only from the Uplay shop or trusted retailers.”
They are still trying to convince people to buy their games overpriced though ;-)