The Deep Silver Forums have an apology to users inconvenienced when their server ran out of authentication keys for Risen, as Steam's weekend sale for Piranha Bytes' RPG caused demand that outstripped their supply of serial numbers (perhaps due to a let-down by their bit supplier). This thread has the outrage from impacted users, who have been placated to some degree by the promise they will be able to activate their game today. Thanks Destructoid.