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All right, the Dusty Falls Dupe Lab has come back with quite a few bits of info about the Redprotect Block Dupe and applications.
>It IS possible to place someone's name on the [private] sign, as with a chest. The plugin therefore makes it so that block is owned by that person and that person alone, as is the sign. Only the people whose names are on the sign have permission to remove the sign, remove the block, place a block under the sign, and move the block by piston. The last permission is where the bug comes into play- if you don't have permission, the block stays where it is, however Redprotect fails to keep a second block from "spawning" where the original was supposed to be pushed- causing the dupe.
>It also means that if you DO have permission (your name is on the sign), you WILL be able to destroy the mechanism, so as to, say, set it to dupe some other block, or move it. The problem with this is that RedProtect keeps track of who started a redstone mechanism- meaning that if you have permission, the dupe glitch never activates, and the block just gets pushed. The one who has permission CANNOT use button or switch-powered dupe machines, but they CAN use clock-based dupe machines- provided that a second player who doesn't have permission starts the clock for them.
>Also noteable is that, for clock-based dupe machines, the person who started the clock is the one who gets spammed with "THIS BLOCK IS PROTECTED, DEUS VULT" -style error messages, not the one actually using the dupe machine.