Something fun I was thinking about. The Famicom Disk System has a weird security measure: On the bottom of each disk is "NINTENDO", with the I and 2nd N further recessed. The FDS pushes something down into those slots; if it can't, the game can't boot. And companies making counterfeits, can't legally put "NINTENDO" there without breaking copyright.
That said, they have found ways around it. Some just leave blank spaces in there, that the I and N objects can fit through. (the FDS disks are double sided, so this one is designed so that it will work on either side.)
My personal favorite one, though, is that they just changed it to the word "INTEND", with the Famicom Disk System mascot (which... should be copyrighted, oops) on either side. Clever?
3rd N. I can't spell.
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