PC Floppy Copy Protection: Vault Prolok (opens in new tab)

(martypc.blogspot.com)

91 pointskmm1mo ago16 comments

16 comments

The accompanying interview with the founder of Quaid Software who defeated the Vault Prolok is also very interesting:

[0] https://martypc.blogspot.com/2024/09/pc-floppy-copy-protecti...

The scheme to damage hardware or data when Prolok Plus thinks someone's using a pirated copy seems ludicrous. Who wants to deal with the liability when this goes wrong due to a bug or unexpected circumstances?

pseudohadamard1mo ago

I remember it being referred to in the press as Killer Prolok at the time but can't find any references from a quick Google, presumably because it was all on dead trees rather than online. I'd never heard the Prolok Plus name until now.

tgsovlerkhgsel1mo ago

"Bright" ideas were and always will be a thing in copy protection mechanisms.

https://en.wikipedia.org/wiki/Sony_BMG_copy_protection_rootk... for a much newer example, albeit non-destructive. I vaguely remember some much more recent destructive examples, not sure if implemented or threatened, but I might be confusing things.

Edit: Found the incident I was thinking about using Gemini. A flight sim addon company FSLabs shipped malware with their installer. It didn't wipe data, it stole your Chrome password manager instead. https://www.reddit.com/r/flightsim/comments/xa58qz/a_retrosp... is a reddit summary, https://forums.flightsimlabs.com/index.php?%2Fannouncement%2... the company explaining/justifying what they did and why (TL;DR it was meant to be a targeted attack against some specific pirates).

spicyjpeg1mo ago

A similar, even higher profile case that shook the electronics industry around a decade ago was chip manufacturer FTDI releasing an update to their drivers that would detect and semi-permanently brick clones of FTDI USB serial bridge chips [1]. The bricking was performed by setting the USB product ID to zero, preventing Windows and macOS from detecting the device at all; the Linux drivers quickly got updated to recognize the new PID, allowing for the development of unbricking tools. Somewhat ironically, the detection relied on errata of the original parts that the clones fixed [2].

The backlash to this measure was massive, as many legitimate products turned out to use counterfeit FTDI parts without the manufacturers' awareness due to unreliable supply chains. Microsoft quickly pulled the update but FTDI seemed not to care for the most part, eventually releasing another similar update a couple of years later that would deliberately corrupt all data sent through clone chips.

[1]: https://en.wikipedia.org/wiki/FTDI#Driver_controversy

[2]: https://github.com/therealdreg/ftdibrick#diving-deep

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charcircuit1mo ago

It seems like it only deletes pirated software. It is hard to understand what they actually claimed it to do without there being an actual source.

asdefghyk1mo ago

For a old geek like me, its a good interesting read.

pkphilip1mo ago

My first consulting gig was writing a copy protection mechanism (floppy-based) for a DOS application. So this brings back memories.

ck21mo ago

ha I had one of those "Copy II PC Option Board" and remember TRANSCOPY

it could pretty much copy anything

copying disks in 1980s was like radar vs radar-detector battle, always escalating

https://www.robcraig.com/wiki/copy2pc-option-board-status/

RaftPeople1mo ago

Central Point Software, the makers of Copy II PC, was one of our customers (we created back office software, order processing etc.).

It was a pretty healthy business, not just for the copy protection breaking but also the general tools software.

Funny story:

I was at their offices working on a project when they were getting ready to ship out the new version. Their warehouse was connected to the office building and they were producing all of the final copies and loading them on trucks to get sent to the distributors.

In the morning they gave the all clear for the first wave of trucks to leave, then about 4 hours later someone found a bug and they had to call all of the trucks back to the warehouse, unload, re-create new clean product etc.

They did this about 3 times before that version finally made it to the distributors.

burnt-resistor1mo ago

Maybe my reading comprehension can't grok it, but it appears defeat-able by MFM reading and recreation like almost every other form of "special disk" modification. Kyroflux, greaseweazle, Copy II PC Option Board, etc.

stefanfisk1mo ago

My understanding is that it worked by doing read/write on a known bad sector to verify that the physical defect is there. Replicating that on normal discs sounds hard.

bombcar1mo ago

The problem with all these protection schemes is somewhere in the code they could usually be bypassed by turning a JNE to an unconditional jump.

So you had to add code to detect modifications which itself could be bypassed.

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