Today I have a sticker in the make of warning sign saying "Critical Infrastructure! Please do not hack!".
It was originally designed by my friend @lycian in German for #35C3 which he later on complemented by an English version. I have a lot of them, ask me if you need one!
If you see these stickers on devices, please respect them - no hacker space is happy about their vending machine being broken into or an assembly's network infrastructure being tampered with.
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