Trust is your only DRM.

In the simplest terms, a "private mod" is any modification for Arma 3 that is not publicly distributed on the Steam Workshop. Instead of a "Subscribe" button, users must download these files via external hosts like Google Drive, Mega, or specialized repositories such as Armaholic (though less common now for strictly private files).

: Many private mods contain assets "ripped" or ported from other games like Call of Duty or Battlefield . Sharing these publicly on the Steam Workshop can lead to DMCA takedowns or bans .

For large-scale, competitive, or narrative-driven events (e.g., Arma 3 "TvT" – Team vs Team), private mods can hide unique vehicles, weapons, or scripts (e.g., custom radar or hacking mechanics) from opposing teams.

This is the boogeyman of Arma 3 . Because private mods bypass Steam's review system, they are a prime vector for malware. There have been infamous cases where unit leaders inserted code into squad XMLs or private mods that allowed remote code execution (RCE) or the "Mod Jail" virus—a script that would literally lock a user’s game, spam their chat, and delete their local profile.

These mods often take the form of: