"Think of it what you want, but piracy is affecting us as a business. However, Bohemia Interactive has tried to grow with the evolution of the Internet, rather than to fight it. We have removed intrusive Digital Rights Management (DRM) from our games several months after release, but cannot afford to launch without such technologies. We strongly believe the best anti-piracy comes from offering valuable online services that people are willing to invest in. Supporting that philosophy: we saw we could not deliver in-house solutions on time, but could take Steam's and expand upon them. It will be possible to run Steam in Offline mode, and still play the game (with the exception of online services obviously, including multiplayer itself)."
No exact release date is yet known. Though Arma 3 will require Steam to play, Bohemia Interactive still plans on distributing boxed copies.