Though it recently removed its onerous always-on DRM requirements of PC games, evidently the fact people are still able to play them remains a concern for Ubisoft. That must be why the publisher ...

The new process is called 'silent key activation' and activates games on platforms like Steam and Uplay automatically rather than giving out codes to retailers and customers.

Gaming Industry Game Development Ubisoft take DRM to the next level by shipping Rocksmith without activation keys News By Tom Sykes published October 22, 2012 ...

Ubisoft has scrapped its always-on and start-up verification DRM requirements for PC games, stating that its new policy as of June 2011 is to only require a one-time activation.

With silent key activation now in place, Ubisoft is refusing to sell its PC game keys through any third-party marketplace that isn't SKA approved.

If you bought one of the affected keys but have yet to play the game, unfortunately the key will remain unavailable, as any unactive keys will still be cancelled by Ubisoft. Thanks MVC and VG247.