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I remember doing something similar with Lemmings 3D. You could simply NOP over the JMP into the copy-protection subroutine. It was surprisingly easy.

Made me feel like such a badass hacker at 15 years old.

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When I was 10 or so, I "cracked" Slam! Air Hockey for Windows 3.1 by opening the exe in EDIT.COM and replacing some random binary garbage with spaces. After a few attempts, I managed to bypass the shareware dialog but also introduced some weird bugs that I don't recall the details of.
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"Cheat enginge"

This was one of those things you really really wanted but once you toyed with it, it sucked the fun out of games and they felt pointless.

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> I was able to replicate that protection mechanism just by scratching a diskette with a pin.

How did you figure out where to scratch it? Was the laser mark visible on the original disk, or did you have to read the code and orient based on the diskette's index hole?

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Yes, it was apparently very visible: https://martypc.blogspot.com/2024/09/pc-floppy-copy-protecti...

But as I mentioned in a sibling comment, I’m not sure it was ever confirmed that it was really a laser that made that mark.

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I described two different scenarios: defeating the protection, and replicating it, e.g. to protect your own software without paying Vault for their "laser" protection.

Defeating the protection didn't involve knowing anything about the laser mark - as the comment I replied to described, it just involved changing a conditional jump to an unconditional one.

Replicating the protection involved causing minor damage on the diskette - the details don't really matter, laser, pin scratch, whatever - then formatting the disk, and registering the pattern of bad sectors created by the damage. A normal copy of the disk didn't replicate those bad sectors exactly, which made it possible to detect that the original disk was not present.

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Ha! I remember disk copy programs which read these bad sector patterns and then replicated the error pattern in software (not on physical disk obviously).

Similar stuff was later used for CDs IIRC.

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Was ist ever confirmed that it was in fact a laser? I wanted to make a trivia question out of this ProLok protection, because “lasers for copy protection” sounds just weird enough to potentially be a nonsense answer without context, but I couldn’t confirm that the holes were indeed made with lasers, and not with other means.
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Their patent (https://patents.google.com/patent/US4785361A/en) doesn’t mention a laser, but of course that doesn’t imply it wasn’t a laser.

I would guess (more or less) identically damaging multiple floppy disks in the same way would be easier with a laser than with something mechanical (e.g. a knife or a drill) (it is fairly easy to control power and duration of a burn), so it might well have been a laser.

On the other hand, disk tracks weren’t exactly tiny at that time in history.

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Good question. I don't know the answer, but I'm quite certain that it didn't really matter what mechanism was used to mark a diskette. Any damage would be equally strong as a way to detect copying.
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Yeah, it matters only in “interestingness” or “coolness”.
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