Multiple of the same CD Keys

[Azman2211]

Hello I bought Arma II(retail) a couple years ago and have recently heard about DayZ so i've purchased Operation:Arrowhead(retail) from Ebay(Still waiting for it to arrive) and also I wanted to play Dayz with my brother via LAN. But now i've found out you can't play online with the same cd key at the same time, so I was wondering if I could buy Arma II:Reinforcements install that on my pc and let my brother just use the Operation:Arrowhead cd key to play or would we have to buy separate copies Arma 2 and Operation.Arrowhead?

[[FRL]Myke]

One unique key per player. So your brother will have to buy A2 and OA (then also known as "Combined Operations"). The DLC's (BAF and PMC) are optional as low res variants are included in the core game and only needed if you want the high res variants. Regarding MP they are not mandatory.

[eddieck]

Check this out as well: http://forums.bistudio.com/showthread.php?129082-ARMA-2-Free-For-Combined-Ops-Lite