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Indeed! Each retail game has it's own unique 'Private Header'. It's this header that makes it safe to play online.I forgot to mention that I've the cartridge of the game, so I wouldn't even need to install it, right?
and thank you ^^
People who use .3DS ROMs don't have a header. So many people insert a Public Header into the ROM which many people can use.
This is one way people get banned from online play though, so it can be risky. If 2 people are using the same Header online at the same time then Nintendo can detect that someone is playing an illegal copy, as there should never be a situation where the exact same header is used by 2 different people!
Since your cartridge is Retail and legal, there's no way that someone else can have the same header as you so you're safe