The ETS2 game engine ignores this encryption bit. This allows the game to read and run the mod perfectly fine while users are blocked from opening it manually.
Security risks
files to prevent others from editing their work or "stealing" assets. Encrypted Game Profiles : Certain game files, such as profile.sii password encrypted file euro truck simulator 2 link
: Protects original creative work and prevents unauthorized re-uploads. Anti-Locking The ETS2 game engine ignores this encryption bit
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