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- Path: sparky!uunet!comp.vuw.ac.nz!canterbury.ac.nz!otago.ac.nz!stanger
- From: stanger@otago.ac.nz (Nigel Stanger)
- Newsgroups: comp.sys.mac.programmer
- Subject: Re: How do you make a master disk?
- Message-ID: <1992Nov16.170946.207@otago.ac.nz>
- Date: 16 Nov 92 17:09:45 +1300
- References: <1992Nov11.161005.23758@kth.se> <1dt8j2INNalk@iraul1.ira.uka.de>
- Organization: University of Otago, Dunedin, New Zealand
- Lines: 26
-
- petrus@stacken.kth.se (Lars Petrus) writes:
- > Some software products are sold on disks that can not be copied - or so
- >I'm told. This means that you can have an installer program on that disk,
- >and only allow a limited number of installations from that disk.
- >
- > But I can not see any way that this can be accomplished. If you copy a disk
- >you copy every byte of is, and thats that.
-
- One thing I've heard of is that you copy your software onto a
- floppy, then physically wipe out one of the sectors on the disk
- (maybe zap the surface coating with a laser or something -- I
- don't really know how it's done). The software looks at this
- sector when it runs, and the cunning thing is that it _expects_
- to get a read error at this point. No matter how you copy the
- disk, the copy program or whatever won't be able to recreate that
- bad sector, so when the software tries to read it that sector and
- _succeeds_ it screams "PIRATE! PIRATE!" and explodes :)
-
- The only way to get around this is to figure out where the
- program reads the dead sector and patch it out.
-
- ----------------------------------------------------------------------
- Nigel Stanger, Internet: stanger@otago.ac.nz
- University of Otago, Phone: +64 3 479-8179
- Dunedin, NEW ZEALAND. Fax: +64 3 479-8311
- Peggy Babcock. Peggy Babcock. Peggy Babcock.
-