295 pointsby zdw7 hours ago30 comments
  • nsoonhui4 hours ago
    I write civil engineering software [0] and am familiar with this kind of dongle. Yes, even today there are users who want this kind of dongle instead of, say, cloud-based validation. They feel secure only if they have something tangible in hand.

    Since we sold (and still sell) perpetual licenses, it becomes a problem when a dongle breaks and replacement parts are no longer available. Not all users want to upgrade. Also, you may hate cloud licensing, but it is precisely cloud licensing that makes subscriptions possible and, therefore, recurring revenue—which, from a business point of view, is especially important in a field where regulations do not change very fast, because users have little incentive to upgrade.

    Also, despite investing a lot of effort into programming the dongle, we can still usually find cracked versions floating online, even on legitimate platforms like Shopee or Lazada. You might think cracking dongles is fun and copy protection is evil, but without protection, our livelihood is affected. It’s not as if we have the legal resources to pursue pirates.

    [0]: https://mes100.com

    • throw1010104 hours ago
      > Yes, even today there are users who want this kind of dongle instead of, say, cloud-based validation. They feel secure only if they have something tangible in hand.

      In my experience this continues to this day due to people who require drawing on air-gapped computers, because the drawings/simulations they work on are highly sensitive (nuclear, military, and other sensitive infrastructure).

      But I'm sure there are also old-fashioned people who like the portability/sovereignty of not having to rely on a third-party license server as you suggest.

    • b1temyan hour ago
      > You might think cracking dongles is fun and copy protection is evil, but without protection, our livelihood is affected.

      I understand you might feel this way, but it seems to me customers are mostly business clients, who would are more inclined to spare the expense of purchasing said licenses, since they're not personally buying it themselves, and would want to have support and liability (i.e: Someone to hold liable for problems in said software.). In fact, having no copy protection would probably have saved you the problem you mentioned where a dongle breaks and replacement parts are no longer available; this is one of the talking points that anti-drm/copy protection people advocate for, software lost to time and unable to be archived when the entities who made such protections go out of business or no longer want to support older software.

      > even on legitimate platforms like Shopee or Lazada.

      On a slight tangent, but I personally don't find either platform legitimate (Better than say, wish[.]com or temu, but not as "legitimate" as other platforms, though I can't think of a single fully legitimate e-commerce platform). Shopee collects a ton of tracking information (Just turn on your adblocked, or inspect your network calls. It's even more than Amazon!), is full of intrusive ads, sketchy deals, and scammers. You yourself said you can easily find cracked versions of the dongle there, which doesn't speak well for the platform. And Lazada is owned by Alibaba Group, which speaks for itself. I'm not sure why consumers in South East Asian regions aren't more outspoken about this, since they seem to be the some of the more popular e-commerce platforms there.

      • samplattan hour ago
        >business clients, who would are more inclined to spare the expense of purchasing said licenses, since they're not personally buying it themselves, and would want to have support and liability (i.e: Someone to hold liable for problems in said software.)

        This is a nice idea but the reality is that there's MANY corporate customers who are happy to get away with casual piracy. Sometimes it's a holdover from when the company was small enough that every business expense is realistically coming out of their own pocket, sometimes they're trying to obfuscate how much their department actually costs to the company at large.

        You think individual consumers lie to themselves to justify software piracy? Corporate self-deception is a WHOLE new kettle of fish.

        • Plasmoid4 minutes ago
          Even at a simple level, if it's between spending weeks going through purchasing or not asking too many questions and getting on with it. I can see a lot of people choosing option B.
    • dataflow4 hours ago
      > from a business point of view, is especially important in a field where regulations do not change very fast, because users have little incentive to upgrade.

      Why should users upgrade or keep paying you when they already bought what they need and don't need anything else?

      • nsoonhui3 hours ago
        Because

        1. Physical dongle tends to break, and when it does, they expect us to give them replacing parts

        2. They do expect bug fixes-- especially calculation bug fixes-- as the bugs are discovered. It's hard to leave their production critical apps broken like that once you know that the bugs can cause monetary or even life loss.

        • Dylan168073 hours ago
          Wanting to say in business makes sense, bug fixes make sense.

          But the actual dongle... look, something like that should have a 30+ year warranty. There should be a plan for how to replace it a couple times before making the initial sale.

      • mschuster913 hours ago
        > Why should users upgrade or keep paying you when they already bought what they need and don't need anything else?

        Because things evolve and inevitably, hardware dies, and you can't get a replacement.

        With an old "dumb" piece of machinery, when something breaks you can either repair the broken part itself (i.e. weld it back together, re-wind motor coils), make a new part from scratch, have a new part be made from scratch by a machining shop, or you adapt a new but not-fitting part. It can be a shitload of work, but theoretically, there is no limits.

        With anything involving electronics - ranging from very simple circuitry to highly complex computer controls - the situation is much, much different. With stuff based on "common" technology, aka a good old x86 computer with RS232/DB25 interfaces, virtualization plus an I/O board can go a long way ensuring at least the hardware doesn't die, but if it's anything based on, say, Windows CE and an old Hitachi CPU? Good fucking luck - either you find a donor machine or you have to recreate it, and good luck doing that without spec sheets detailing what exactly needs to be done in which timings for a specific action in the machine. If you're in really bad luck, even the manufacturer doesn't have the records any more, or the manufacturer has long since gone out of business (e.g. during the dotcom era crash).

        And for stuff that's purely software... well, eventually you will not find people experienced enough to troubleshoot and fix issues, or make sure the software runs after any sort of change.

    • jbm4 hours ago
      My dad used to use this kind of dongle for a civil engineering program called 'Cosmos'. Just wild to see it, it was so annoying to because sometimes it would simply not be detected on our 80386.
    • SecretDreams4 hours ago
      > which, from a business point of view, is especially important in a field where regulations do not change very fast, because users have little incentive to upgrade

      This take is diametrically opposite to what end users need. In a world where "if it ain't broke, don't fix it" is perfectly fine for the end user, buying a one off license for a software seems much more sane then SaaS. SaaS is like a plague for end users.

      I don't condone piracy, but I also don't condone SaaS.

      • nsoonhui4 hours ago
        In a perfect world, I would have agreed with you, even if it's diametrically opposite to my interest as a software developer cum business owner.

        But in an imperfect world whereby our dependencies ( software components that we use) and platforms that we need to build/rely on ( like Civil 3D) do charge us on annual basis, and that some of users expect perpetual bug fixes from us, with or without a support contract of sorts, SaaS seems to only way to go for our sustainability.

        • SecretDreams3 hours ago
          There's gotta be better middle ground. Release something polished and only fix major bugs/vulnerabilities for free (because that's a liability). Minor bugs are accepted for a one off cost (I'm still using Microsoft 2016, e.g.).

          We've all got to push back against these bloated saas models that don't bring tangible benefits to end users and serve only to pad company valuations. Make new versions of your software with features meaningful enough to encourage people to upgrade and outline support periods for existing software sales after they buy a one-time license. There's gotta be a better way. For everyone (except big tech CEOs).

      • charcircuit3 hours ago
        If a user gets ongoing value from software it makes sense for them to be willing to pay ongoing for that value. What users need is that the value they get from a product is more than the money they are trading for it. A one off license would be the result of a race to the bottom due to competition.
        • icameron3 hours ago
          Sure, if there is increasing or evolving utility being offered. But it’s also fair to charge for upgrades in that case.
        • SecretDreams3 hours ago
          If I get ongoing value from my fully paid off car, should I keep paying the OEM? How about my house or my bike or my shoes? My toilet (huge ROI on this one)? My fridge?? Why do we feel that software gets to impose this ridiculous SaaS model? The only real answer is "because they can", not because it's helping anyone.

          Reality is that many modern software developments have plenty in common with designing a toilet. You spend time identifying the problem statement, how you can differentiate yourself, prototype it, work out the bugs, ship the final product, and let sales teams move the product. The difference is the toilet can't be turned into a SaaS (yet) and, if it ever could, that would break functionality because you're supposed to poop in it, not have it poop on you.

          • charcircuit2 hours ago
            I think it would be fair to keep paying for a car, house, bike, shoes, toilet, and fridge. If I'm still using such great products, why not reward the creators of them. But as a consumer I am also price conscious so if a competitor can offer an equivalent product for cheaper I will go with them.
          • misiran hour ago
            I am not sure if the replies are serious or sarcastic
          • ryandrake3 hours ago
            Seriously, I have a house full of appliances, tools, clothing, and so on, that I get "ongoing value" from and whose manufacturers don't have the gall to try to charge me monthly for. Totally unacceptable business model.
    • huflungdung4 hours ago
      [dead]
  • ruleryak5 hours ago
    Many a crack back in the day was even more simple still, we'd just find and alter the right JE or JNE into a JMP and we're off to the races. As the author found, the tough part is just finding and interpreting where and how the protection was implemented. If throwing the exe in a hex editor gave you access to String Data References (not always the case, but more common than not) then you'd just fail the check you were trying to skip, find that string, hop over into assembly to see what triggered loading that, and then just alter the logic to jump over it when the time comes.
    • hinkley3 hours ago
      There's a lot of things going on that lead to this.

      One, the developers spend more time running this code than we do, and they have to get the program working before we can even use it. So any parts of the program that are hostile to the developers risks killing the entire project. Obfuscating the copy protection can hit a point where it makes bug fixing difficult.

      Two, lack of training. If you, me, and Steve each have a bag of tricks we all use to crack games, whichever one of us figures it out gets bragging rights but the game remains cracked. Meanwhile Developer Dan has to be aware of all the tricks in all of our bags together if he wants to keep the three of us out. Only there's not three of us, there's 300. Or today, probably more like 30,000.

      Three, lack of motivation, which is itself several different situations. There's a certain amount of passive aggression you can put into a feature you don't even really want to work on. You can lean into any of the other explanations to defend why your code didn't protect from cracking all that much, but it's a checkbox that's trying to prove a negative, and nobody is going to give you any credit for getting it to work right in the same way they give you credit for fixing that corner glitch that the QA people keep bitching about. Or getting that particle animation to work that makes the AOE spells look badass.

    • m4632 hours ago
      I remember I had some demo software that could be enabled with a code. I was just curious and at the code prompt, I entered the debugger. I dumped the process space and there was a nul-terminated string of letters and numbers. I restarted the process and entered them at the prompt and voila, it was enabled.

      (I did go on to pay for the software)

    • antonvs4 hours ago
      > Many a crack back in the day was even more simple still, we'd just find and alter the right JE or JNE into a JMP and we're off to the races.

      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.

      • foresto3 hours ago
        > 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?

        • anyfoo3 hours ago
          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.

        • antonvs3 hours ago
          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.

          • lstoddan hour ago
            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.

      • Aaargh203183 hours ago
        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.

      • anyfoo3 hours ago
        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.
        • antonvs3 hours ago
          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.
  • seblon2 hours ago
    Yeah, Software protection was very naive in the beginning. Fun fact: I owned a windows 3.11 for workgroup UPGRADE disc collection, it was clearly explained and also enforced from the setup installer. So, no previous installed win 3.0 == upgrade installer will fail. The fix: just create an empty Textfile named win.com at any place - the installer simple scans the WHOLE disk just for this existing filename. Next fun fact: in reality, the Upgrade contained the full installation, no only a delta. Men, software was so simple these days....
    • mikepurvis2 hours ago
      I have a childhood memory of my dad buying a shrink-wrapped copy of the Windows 3.1 Upgrade that was supposed to allow any installation of "3.0 or earlier" to become Win 3.1. it turned out when we actually tried it it only accepted 3.x though. [1]

      I think he ended up pirating a 3.x install from a friend and running the upgrade on to of that; felt pretty morally clear given what the box had advertised.

      [1]: eg https://www.ebay.com/itm/376080245422

  • dehrmann5 hours ago
    > I must say, this copy protection mechanism seems a bit… simplistic? A hardware dongle that just passes back a constant number?

    Seems like it was an appropriate amount of engineering. Looks like this took between an afternoon and a week with the help of an emulator and decompiler. Imagine trying to do this back then without those tools.

    • 151555 hours ago
      Audience matters. Something intended to stop legitimate business consumers in a non tech industry requires substantially less sophistication than something built to withstand professional reverse engineers.
      • Gigachada minute ago
        These days there would be an Aliexpress listing selling fake dongles within a month making it easy for the business customers too.
      • dwattttt5 hours ago
        Locks are there to keep honest people honest.

        To expand on the saying, they're not there to be insurmountable. Just to be hard enough to make it easier to do things the right way.

        • nkrisc4 hours ago
          And often they’re there so no one can plausibly say they didn’t know what they were doing or stumbled into it accidentally. You can’t “accidentally” go through a door with a padlock on it.

          I’d guess it’s something similar with this dongle. You can’t “accidentally” run the software without the dongle.

      • classichasclass5 hours ago
        Copy protection was also generally less robust for educational software, since it sold to generally law-abiding folks (parents, educators, etc.). Never saw Rapidlok or V-MAX! used for educational software on the Commodore 64, for example.
    • bri3d5 hours ago
      In fairness, the decompiler didn't work on the protection method :)

      I think that both halves of the author's thesis are true: I bet that you could use this device in a more complicated way, but I also bet that the authors of the program deemed this sufficient. I've reversed a lot of software (both professionally and not) from that era and I'd say at least 90% of it really is "that easy," so there's nothing you're missing!

    • opinologo5 hours ago
      Iremember doing exactly this kind of hack for a small telco in Bueno Aires. Extel. Around the year 2000.

      In most cases it was not much more difficult than what OP described.

      • iamflimflam14 hours ago
        I worked on some software that was used by telcos around that time - you were probably hacking our dongles :)
    • cyanydeez5 hours ago
      Yeah, my IT company bitshifts suspect files and provides the magic number.

      The protection just needs suficirntly complex.

  • dunham4 hours ago
    Back when I was a kid in the 80's. I cracked one of the Ultima games. I had it on my hard drive and didn't want to stick a floppy in every time I ran it.

    The code decrypted itself, which confused debuggers, and then loaded a special sector from disk. It was a small sector buried in the payload of a larger sector, so the track was too big to copy with standard tools. The data in the sector was just the start address of the program. My fix was to change executable header to point to the correct start address.

  • aizk5 hours ago
    Very cool to read an article about windows 95 still being used in production - a nice contrast to the infinite AI hype cycle over everything. Tech may move fast in flashy areas but not in the more "boring" parts of the industry.
    • accrual4 hours ago
      I knew of a Windows 95 host running virtualized in a corp environment until at least 2014 or so. It was surprisingly sturdy, I only had to remote into it once or twice when the old software it was running hung up on something. It was old medical software and we apparently had a couple clients still interfaced to it.
    • 1970-01-015 hours ago
      The screenshots show the program was made for DOS. Very likely Windows was used just for network file sharing.
    • jojobas4 hours ago
      Win95 is only 30 years old and runs natively on some modern hardware.

      Apparently there is important stuff still running in emulated PDP-11s, almost double the age.

  • jedberg4 hours ago
    > I must say, this copy protection mechanism seems a bit… simplistic? A hardware dongle that just passes back a constant number? Defeatable with a four-byte patch?

    Nowadays we don't bother with copyright protection other than a license key, because we know enterprises generally will pay their bills if you put up any indication at all that a bill is required to be paid.

    This was basically the 80s version of that.

  • dhosek40 minutes ago
    I remember reading an ad in one of the 90s PC magazines that attributed the dongle to an inventor named “Don Gull.” I was fortunate enough to never have to use a hardware dongle, but I remember hearing about their persistence into the twenty-first century. I would imagine that most of them were as ridiculously simple as this one was.
  • sonixier5 hours ago
    The company i work at has the same problem. We have some old mission-critical windows 2000 pc that runs the rpg compiler, with attached dongle. This gave me some clues on where to start - thanks author!
  • 51Cards2 hours ago
    I was hired in the early 90's by a collection of franchises for a home care company. The privately owned head office self-developed and distributed required monthly updates to the only software franchises were permitted to run their business. The monthly updates (floppies) reset the license for another month at each location. After years of problems, poor support, and in a couple cases offices getting shut down because head office just "didn't like them anymore", they banded together to sue the owners (one of which developed the software). I did IT work for a couple of the offices and was already familiar with maintaining the software / systems. They hired me to bypass the licensing code which was a lot of fun to figure out. In the end I wrote a DOS based license generator each office had that could update their software by just getting a code over the phone for the upcoming month (or any date for 365 days). A few years later once the lawsuit settled and the company broke apart we issued a patch for the software to remove the license check completely. I should fire up DOSBox sometime so I can play with that old software again.
  • boarsofcanada2 hours ago
    I wrote RPG II code in the 80s and helped the company I was working part-time for transition to another one of these S/36 emulation environments on the PC in the 90s. The software we used was made by the very generically named California Software Products.

    It worked well enough and allowed the company to run until the founder retired and folded the business.

  • izme4 hours ago
    This takes me back. There exist emulators for these dongles as well, you run the a dumper with the dongle attached and load the program and it makes a dump file which you then use in the emulator.

    I had to do this for a company so they could continue to use their old specialised Win98 software on modern computers using Dosbox and an emulator.

  • Sophira2 hours ago
    The fact that the software and hardware is evidently still in use at some companies gives me pause about whether releasing it in a cracked form publicly after having published it on a personal website would be a good idea.

    Software companies love to milk enterprises for all their worth, because they're the entities who will pay the most amount of money if it means that the software they use can still work - and a big part of how they do this is via vendor lock-in. We can see in this article that this company was still using Windows 98 - they're clearly locked-in!

    All of which is to say that this intellectual property might actually still be owned by a company who'll be able to sue.

    If you haven't already checked whether the patent and other intellectual property is still owned by any company, OP, I would strongly suggest doing so first.

  • odomus3 hours ago
    Is defeating a 40-year-old copy protection mechanism still illegal under Section 1201 of the DMCA, or have they changed the law to make an exception for "very old" software?
  • charcircuit3 hours ago
    >The only evidence for the existence of this company is this record of them exhibiting their wares at SIGGRAPH conferences in the early 1990s, as well as several patents issued to them, relating to software protection.

    There is also their webpage for ordering PC RPG II. The company address is a residential house.

    https://web.archive.org/web/20010802153755/http://home.netco...

  • zabzonk3 hours ago
    I think I remember hacking some of the copy-protection out of a version of Tetris using the Borland debugger. I definitely patched mouse support into a Chris Crawford "Battle of the Bulge" game using it (for my rather tricky platform). That was a good debugger, and probably the last one I have used much - prefer logging/printing for stuff I write myself.

    I remember my Dragon 32 (6809, Color Computer clone) had a dongle you plugged into the joystick port to protect a really crap game - Jumping Knights? I never tried to defeat it.

  • 3 hours ago
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  • smoyer2 hours ago
    I designed a security dongle a long time ago ... Used properly, it did rotations and XORs like a CRC. You could definitely make it hard to defeat but it was still ultimately deterministic.
  • insuranceguru4 hours ago
    wow, the home accountant is basically the great-grandfather of everything we do in modern financial and actuarial modeling. dmitry's breakdown is like digital archeology.

    it’s wild to think about the hardware risk people used to accept putting your entire household's financial history on a system that bricks itself the second a 40-year-old plastic dongle fails. really great read.

  • Tempest19813 hours ago
    So what hardware would be inside the dongle? Would a small PAL be enough? 22V10? Maybe use a few registers to delay the values written by a few cycles, mixing in some decode logic? (Something cheaper than a microcontroller, I'm guessing... due to cost)
  • accrual4 hours ago
    Fun journey! It would be fascinating to see what's inside the dongle. I wonder if it's programmable or just a simple circuit.
    • byb3 hours ago
      Yes, a neat follow-up would be to clone the copy protection device with a cheap microcontroller. A lot of these devices were filled with epoxy, but it would be funny to find out these were all just 1Kbit EEPROMs. Such an article could give some background on parallel port communication, EEPROMs, and how regular printer data was passed through.
  • firecall2 hours ago
    Cracking this dongle; wouldn't this be a federal offence in the US?

    Not being snarky - genuine question! I am not from the US :-)

  • kwanbix5 hours ago
    My father, an accountant, used to have a program like that, that used RPG and a dongle! Good times. Horrible donle.
  • dmitrygr5 hours ago

      >Very importantly, there doesn’t seem to be any “input” into this routine. It doesn’t pop anything from the stack, nor does it care about any register values passed into it. Which can only mean that the result of this routine is completely constant!
    
    This is not necessarily a fair assumption (though it worked this time). It could be some sort of a rolling code, where the reply is not constant but changes, and remains verifiable. Example: garge door openers have no input from the garage, but the sent signal differs every button click, and the garage can verify its correctness
  • DANmode3 hours ago
    > Is this really worthy of a patent?

    You have no idea how deep this rabbit hole goes.

    Patents are barely better than copyright, as far as society net-positive.

  • burnt-resistor4 hours ago
    And they probably could've just used Neverlock Business which cracks zillions of programs.
  • catlikesshrimp5 hours ago
    Why wasn't (isn't) this more widely used? It was clearly more effective than a cdkey.

    I know there is cost associated with the hardware, but surely the costumer can cough 15 more dollars.

    The only reason I can think of is wanting as wide adoption before max revenue as possible. But then, this has never been too popular, not even for games!

    • bri3d5 hours ago
      Dongles were extremely widely used in the 1990s and early 2000s; for anything more advanced than consumer software you'd almost expect them? Almost every DAW, video editor, high-end compiler, engineering/CAD package, or 3D suite used them, certainly.

      I think sometime in the late 1990s FlexLM switched from dongles to "hardware identifiers" that were easily spoofed; honestly I don't think this was a terrible idea since to this article's conclusion, if you could reverse one you could reverse the other.

      But this concept was insanely prevalent for ~20 years or so.

      One of the biggest problems was not having enough ports. Some parallel port dongles tried to ignore communication with other dongles and actually had a port on the back; you'd make a "dongle snake" out of them. Once they moved to USB it was both easier and harder - you couldn't make the snake anymore, but you could ask people to use a hub when they ran out of ports.

      • Joe_Cool4 hours ago
        P-CAD even had a dongle-caddy where you could plug in I think about 7 of them into to unlock different modules.

        I will check if I can find an image of it.

        EDIT: here is an old listing of it: https://www.ebay.com/itm/187748130737

        Sadly the lid isn't open so you can't see what modules are installed.

    • sowbug26 minutes ago
      Dongles still exist in the form of Nintendo Switch cartridges, though they're an extreme form that contains all the app logic, rather than just 7606h.
    • GuB-424 hours ago
      Having to put a physical device on your parallel port at the back of the computer is kind of annoying, especially if every software you use has one.

      More common for games was to use the media itself for copy protection, using a variety of tricks to make copy more difficult. Other techniques involve printing some keys you have to enter using colors that don't render well in photocopies, or have you look at words a certain page of a thick user manual, the idea being that it is more expensive to go through the effort of copying this material than to buy the software legally.

      One of my favorite is from Microprose games, for which the manual was a pretty good reference book on the subject of the game, that alone is worth buying. And the copy protection is about asking you about information contained in the book, for example, it may be some detail about a particular plane in a flight simulator, which means that a way to bypass copy protection is simply to be knowledgeable about planes!

      Dongles were common, but mostly for expensive enterprise software. Also, dongles don't make cracking harder compared to all the other techniques, so for popular consumer software like games, it is likely to be a lot of inconvenience and a waste of money for limited results.

      • exidy2 hours ago
        Partly it was an anti-Wobbler thing. Someone in America or somewhere thought it was real clever to make the game ask you little questions, like “What’s the first word on line 23 on page 19 of the manual?" and then reset the machine if you didn’t answer them right, so they’d obviously never heard of Wobbler’s dad’s office’s photocopier.

        -- Only You Can Save Mankind, Terry Pratchett, 1992

      • ryandrake3 hours ago
        Makes me sad how many person-years of effort have been wasted over the years on futile dongle-engineering, copy-protection and DRM. They're pretty much all cracked. And the industry keeps insisting on trying!
    • jandrese4 hours ago
      One problem is that they often couldn't be daisy chained, the connector on the back was only useful for an actual printer. So if everybody started doing it you would have to swap them constantly which is a headache. So they're mostly used for software where it's going to be the only thing running on the box.

      I find it interesting that they didn't make it into the USB era where you could easily have something that does some actual processing on the device that makes it a serious challenge to reverse engineer.

      • chrisldgk4 hours ago
        They did carry over into the USB era! I specifically remember my stepdads copy of Cubase (music production software) requiring a USB dongle to open.
        • bonzog3 hours ago
          Ditto - and there's also the "iLok" dongle used by loads of virtual instrument & effects plugins for DAWs.
      • jofla_net2 hours ago
        I could have sworn, back in my day, on WinNT4 we successfully chained a red and white pair from Autodesk. One for AutoCad, and either Mechanical Desktop or 3ds Max.
    • ok1234565 hours ago
      It was widely used in engineering software because the license cost was equivalent to a large fraction of an engineer's salary. Anyone who used AutoCAD back in the 90s can remember.

      When parallel ports were discontinued, they migrated to USB and network license servers.

      • dpb0012 hours ago
        A company I worked for in the mid-80’s used a PC based CAD package with this kind of copy protection. IIRC the cost of the software was about $5K, and engineers using it probably made around 50K/yr. This level of expense required a lengthy capex justification approval process. There was a category of users who didn’t need the software full time and since the software was tied to the dongle it was common to have the package installed on multiple workstations and borrow the dongle when needed.

        The nature of our business was such that there was a lot of logic analyzers and signal tracing equipment in the lab and the dongle was reverse engineered and cloned after a couple of “where’d my dongle go” incidents.

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