There have been a few paper-based storage projects... I would guess that you're thinking of "PaperBack"[0] or maybe "rainbow storage"?[1] 0: http://ollydbg.de/

There have been a few paper-based storage projects... I would guess that you're thinking of "PaperBack"[0] or maybe "rainbow storage"?[1] 0: http://ollydbg.de/Paperbak/ http://ollydbg.de/Paperbak/ 1: https://en.wikipedia.org/wiki/Rainbow_storage https://en.wikipedia.org/wiki/Rainbow_storage