Slitherine

My father and I own separate games. If I bought the Grand Campaigns could I install those on multiple machines (different Serial Coded games) or would those come with their own unique code allowing only one install?

In otherwords, can these DLCs be shared?

No Grand Campaigns cannot be shared - everything we sell has a single user license. It would really screw up your system and break anything related to multiplayer if you tried this.