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?
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.
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.
Similar stuff was later used for CDs IIRC.
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.
I have almost no doubt that it could be a laser, it’s just unfortunate (and maybe a little bit suspicious) that I haven’t found it confirmed anyway. Almost like they wanted it to be a laser (hence the folklore around it), but had to use a less cool method to do it. But of course it might as well just have been a laser, and they for some reason declined to market or even just document it that way, for whatever reason.
Made me feel like such a badass hacker at 15 years old.
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.
I did that with dBASE III, which used ProLok "laser protection" from Vault Corporation - a signature burned onto the diskette with a laser. Back then, I found it amazing that Ashton-Tate actually spent money to contract with a copy protection company for something that could be so easily defeated by a teenager reading assembler.
They could have easily just written the same kind of code themselves. An example of the power of marketing over substance.
I was able to replicate that protection mechanism just by scratching a diskette with a pin. The "laser" was a meaninglessly advanced-sounding solution that added no value compared to any other means of damaging a diskette.