Ubisoft has confirmed that the PC version of Watch Dogs will require a mandatory activation via the publisher's Uplay service.
All PC versions of the game, including those bought through Steam, will use a mandatory Uplay client that players will have to log on to in order to activate the game.
"Like some of our other AAA releases, including Far Cry 3, Splinter Cell Blacklist, and Assassin's Creed IV Black Flag, Watch Dogs will be available on Steam and will leverage Uplay to support the games services," a Ubisoft representative told IGN.
In February, Ubisoft confirmed that South Park: The Stick of Truth would not require a Uplay account, and was instead "a Steam game, with Steam achievements".
Uplay has been the source of much contention since its launch alongside Assassin's Creed 2 in 2009. However, the service has had many of its restrictions lifted over the years, including its controversial requirement that players stay online and connected to Uplay at all times, even when playing single-player games.
As a result, most Uplay games now require a single activation upon launch, at which point the game is able to be played offline.