So... I've dumped my 1581 demo disk to a file and had a closer look at it. I didn't expect to find strings like these: "JUST MOVED INTO A HOUSE THAT WE PLAN ON STAYING IN NOW, PROBABLY FOREVER..." "ES, AND THE COPY CAN'T BE REGISTERED BECAUSE THE NUMBER ON IT IS ALREADY REGISTERED." From some more strings I estimate that that's part of a bbs conversation that some people had. Not sure if they didn't fully wipe their master disk or that was on the disk before it got partially overwritten.