Please create an account to participate in the Slashdot moderation system

 



Forgot your password?
typodupeerror
×
Music Media

SDMI Officially Reports on SDMI Hack 136

A reader sent us the press release that the Secure Digital Music Initiative folks have put regarding the hack SDMI challenge. They are stating that three out of the five were not cracked, contrary to earlier reports, and that of the two that were cracked, one was not a replicable event. Meanwhile, Salon has continued their coverage of the whole shebang.
This discussion has been archived. No new comments can be posted.

SDMI Officially Reports on SDMI Hack

Comments Filter:
  • by cybercuzco ( 100904 ) on Wednesday November 08, 2000 @12:53PM (#637092) Homepage Journal
    no matter what happens with SMDI it will be cracked. I think that the fact that even part of it was cracked with a massive boycott going on speaks to the encryption schemes weakness. Even if the whole thing had been broken, i dont think SMDI would have released the fact. They have too much money riding on it now to start over with something new, which is what they would have to do if everything was cracked. what will be important in the following months is that if SMDI is actually released into the wild or not. If it isnt, i suspect the whole thing has been cracked, if it is, then it will be cracked soon enough. Either way mp3's are the future of music, not smdi.

  • by segmond ( 34052 ) on Wednesday November 08, 2000 @12:54PM (#637093)
    If it was broken, AND there system could not detect ie the watermark, do they consider not cracked if THEY determine that the sound quality is not good enough? good enough for who? for them? for the people who will be glad to pirate it?

  • Are you confusing "effective access control" with "perfect/absolute access control"

    Would not anything less than "perfect/absolute access control" be, in actuality, "ineffective access control"? Either you control or you don't.


    "A microprocessor... is a terrible thing to waste." --

  • Does it stop anyone from making copies. Whats the point.

    No, but it stops people from using their copies on SDMI systems. For example, what if your speakers are SDMI-compliant? "You don't have authorization to play this CD; it is owned by Foobaz Library."

  • Certainly.

    For that matter, it's easier than that. Wait until SDMI comes out. Someone with a few extra bucks can go pay for the new version of Real Jukebox that can watermark songs. Rip a track, watermark it, and compare the watermarked copy to the original. The watermark will stand out.

    Repeat the process a few times, perhaps with a couple different paid-for copies of RJ to see what parts of the watermark are serial numbers, etc.

    SDMI is stillborn, we might as well let the RIAA spend time and money on it. It will keep them from doing anything productive in the meantime. :)
  • If you can make it, someone will break it. I have absolute faith that something can be encrypted such that {DNA|quantum|brute force} methods are all infeasible. What if your cipher doesn't have discrete states?

    -- LoonXTall

  • We need help if mp3 is indeed the future of music.

    What is the appeal of mp3? File size. What happens as everything gets bigger, ie more bandwidth, more storage, etc.? We won't be worried about file size. There goes mp3's main advantage.

    The future will definitely be a lossless algorithm, not mp3.
  • SCMS only prevents SERIAL copying. there is nothing that prevetns you from making more than 1 or 2 backups, right?

    i'm not trying to pick a fight here so stop me if this argument has been rehashed, but if i drop my VCR, Sony has no obligation to correct my stupidity. if you destroy your CD, you buy another one too, right?

    (yes i am naive) doesn't the number of copies depend on the EULA anyways? here, they are allowing you to make as many 1st generation, digital copies as you like, AFAIK.
  • by algae ( 2196 ) on Wednesday November 08, 2000 @03:50PM (#637100)

    In an SDMI world, your soundcard would refuse to play the new .wav because it still has the magic mark of Cain.

    Do you realize how *unlikely* this is to happen? Your average game probably has between several hundered and several thousand sound effects, and maybe a few dozen cinematics. Suddenly, every single one of them has to be encoded with the watermark from a completely different industry, just because they happen to both use the same hardware. Amateur musicans would be another group who might not quietly accept getting screwed if SDMI hardware becomes the law.

  • In legal terms effective is probably defined as a "sliding term" used in relation to a situation.
    i.e. the lock on your front door is effective for a personal residence but ineffective for a bank.
    The courts who be the ones who define what is effective for a given situation.
  • It holds true for DVD too. In fact, you can find ripped DVD movies compressed to DivX and MPEG format (DVD is MPEG-2 to begin with) all over the net.

    And this was happening BEFORE DeCSS. DeCSS makes it easier to transfer the DVD data to other formats but the pirates were already using other methods of ripping the data out (mostly of the type listed above where they would play the DVD through an analog line and recapture it to digital in a non-secure format).

  • So why doesn't it apply also to DVDs? --> Copy a DVD to VHS [...]

    I don't know about BETA or Hi8, but I'm fairly sure that modern VCRs are supposed to have copy-protection circuitry in them. I've seen tapes that have been copied from rental copies, and they turn out all orange, unless you're recording with an old enough VCR.

    Do DVD players put out this "copyright" signal as well?

  • Personally, I think that the SDMI is just lying about the fact that only 2 watermarks were cracked. They're just protecting their asses. It's impossible that if they sent the watermarked files out to tons of universities in the USA that they wouldn't be cracked by now. I think they're just saying this so the RIAA and his little friends dont get all peeved off and have to research a new technology to attempt to secure music. And also, even if they are cracked, there is apparently a loss of quality. My answer: Who cares! There is a loss of quality from the original perfect mint quality music track but big deal, nobody downloads the perfect copies anyway. I'd have something to say about it if they had to drive the quality down less than 128 but for now it doesnt bother me at all.

    Just my $0.00002 (new technology finds ways of cutting pennies in to veeeeeeeery small pieces :)

    -orakle

  • the sound engineers that were selected to test the quality were all from RIAA organizations. And of course, RIAA wants the cracks to fail.
    The listening tests were all supposed to be double-blind, though. Only the "ear-goldenness" of the listeners should matter, and not their organizational affiliation, unless your fear is that the RIAA members secretly employ clairvoyants. :)

  • firstly, i think we should all welcome this great victory for SDMI, and we should congratulate them for changing the entire world so it is completely safe from evil music pirates. bottom line, release SDMI ***NOW*** so we can crak---errr... listen to the wonderful music on DVD-audio, buy digital music online and all that good stuff. in short, SDMI release music, players and everything RIGHT NOW!!!!!

  • I just read on CNN that Al Gore, if it turns out he has to concede, is switching from politics to digital music security.

    In a quote from Mr Gore, he stated "These companies are going about the matter all wrong. Digital watermarking isn't going to work. What we need to do is take new music, and put it away in a lockbox, one to which only the President and the Speaker of the House have the key. With the music locked up tight in this lock box, it will be safe and piracy free for future generations."

    Mr Gore went on to say "We want Britney Spears and other artists who could be hurt by music piracy to know that a promise made is a promised kept."

    Editors Note: Mr Gore's previous technological experience includes inventing the Internet.

  • by Mad Hughagi ( 193374 ) on Wednesday November 08, 2000 @12:57PM (#637108) Homepage Journal
    A coalition of cryptography and watermarking researchers from Princeton University, Xerox PARC and Rice University claims to have successfully defeated a music protection system proposed by the Secure Digital Music Initiative (SDMI). - From Salon

    The only consideration is that this group hasn't submitted their technical information (which automatically excludes their attempt from being considered). Now I don't know about most skeptics, but when a group of this stature claims to have done something, I would guess that they were being sincere - how many universities would allow research groups to do work on something like this and then make false claims?

  • What's to prevent me from taking an SDMI-protected song, dumping it to a .wav file [1], and then re-encoding it with, say, ogg? As a worst case scenario, I could set up a loopback with the D/A A/D converters on my soundcard to get the .wav. Will the watermark still exist in the .ogg file? Does that matter?
  • by beckett ( 27524 ) on Wednesday November 08, 2000 @01:00PM (#637110) Homepage Journal
    I remember a few weeks ago there was that streaming radio interview with Chiariglione, some linux webpage, some guy from 2600.org, and the FSF. in that interview, Chiariglione addressed several issues involving "fair use", and he said (rightly) that and SDMI will provide someone with the ability still to copy, but not serially (like the presnet SCMS).

    The FSF rep wasn't able to respond to this, but from my point of view, SDMI's ability to make a limited number of digital fulfills the "free speech" needs of the FSF, which was their main concern.

    what do people think about that? do i have this wrong?
  • Why rent when you can get them for free at your Local Public Library?
  • Actually, it was the EFF, not the FSF.
  • Do they really think that anything they come up with is going to be secure. People will continue to rip CD's and find ways napster or otherwise to distribute it. Lets get real here.
  • Its really about the sound data in the file. Hence the name 'watermark'.

    If I put a watermark on a piece of paper, and you use a (high-quality) copier on it, the watermark will still exist. The same sort of thing applies if you re-record the music, even if you switch it to analog and back to digital, or so I'm told.

    The point here, as I understand it, is not to prevent piracy, but to be able to detect it.

    Each song, then, would have a unique 'ID', which would be associated with your name when you buy it. If it shows up on napster, they come after you for the royalties.

    If I'm right, hope this helps. If I'm incorrect, please correct me.

    Zipwow
  • actually i'm not signal11... atleast not consiously(don't know if i post in my sleep)
    and apparently according to zdnet:
    http://www.zdnet.com/zdnn/stories/news/0,4586,26 51707,00.html
    they have approved 3 technologies...atleast one of whom felton of princton claims to have broken... heh
  • Sure, anyone can copy cassette tapes, and lots do. That didnt stop PLENTY of cassette sales.

    That is because you couldn't make 100,000 copies of one song with a very few actions (Napster...)

  • by pb ( 1020 )
    Do they really think *that* makes it secure?

    Well, if they do, they can feel free to release it. ;)
    ---
    pb Reply or e-mail; don't vaguely moderate [ncsu.edu].
  • The Record Rental Amendment prohibits renting of phonorecords such as cassettes and CDs without express permission from the copyright holder (generally an RIAA member label). This applies only in the United States.
  • the thing that makes mp3 cool is that it's not tied to anything to make it work. mp3 doesn't require a decryption key (which limits its portability), it doesn't require you to "pre-register" before you listen, it's totally anonymous (so people can't track your bizarre listening habits), etc

    how many encrypted songs will you have to buy in order to listen to them on A: your computer, B: your portable SDMI device, and so on and so on..

  • What do you expect? If they actually acknowledged a real winner, they'd have to give out money (and we all know how they hate to do that) AND effectively toss away all the cash they'd thrown into it. (Never mind that part of the point of research is to find out what doesn't work!) Plus, it'd be really bad from the PR point of view...

    Oh, well. Its also obvious that the technological solution is just to reduce the number of people taking advantage of their fair use rights to those who would do it anyway, to reduce the number of targets for the legal teams to mob...


    -RickHunter
  • by g_mcbay ( 201099 ) on Wednesday November 08, 2000 @01:11PM (#637121)
    In reality it doesn't matter...Your assement is correct.

    The music industry blindly believes that as long as you can't make a perfect digital copy, their investment of millions into a protection scheme is a good one.

    The music industry is wrong..Nobody seems to mind all the fairly crappy (compared to 'perfect digital copies') MP3 rips on Napster. Nobody will mind a protected song going to over high quality analog and being redigitized back into an unsecured format (Ogg or MP3).

    It is all an exercise in futility and corporate self-ass-protecting.

  • by AugstWest ( 79042 ) on Wednesday November 08, 2000 @01:11PM (#637122)
    "Each submission -- whether successful or not -- taught us important lessons about what can and cannot work in the marketplace."

    Ok, lesson here is... if you can encrypt it, someone can break it. Plain and simple.

    If it can be streamed, it can be recorded.
  • by MarNuke ( 34221 ) on Wednesday November 08, 2000 @01:11PM (#637123) Homepage
    Is there such a thing?

    Ok, let say you make it where a watermark is 'somewhat secure' (there is nothing "secure" only "somewhat secure"). Say it uses a bunch of random bits that is encoded in the music. What would stop someone from just remvoing the code from the music? The DMCA?

    Everyone here has seen a sound wave. Wouldn't the "code" produced abnormal spikes somewhere in the wave? With a powerful sound processor, it could be possiable to proccess the wave in a way to detect the code and remove it. Oh course this is analog.

    With digtal music, random bits can be place in locations where typicaly would not produce sound or abnormal sound. Drawing from a "clean" sample patterns can be found for the encoding. Do some math, and the water become clear as day. Once the pattern is found on the single sample, you have to find out how this sample compare with another samples.

    This is where it gets complex. If the music effects the pattern of the watermark, one would have to figure out what influece the pattern. It can be rather complex. But here's the problem. One can't just add a bunch of random bits on digtal music and expect it to sound the same. Figuring out where to put the bits, helps the cracker, becuase it makes it easier to find a pattern.

    Also, one is limited to the number of bits to the lost of enjoyment. How many can you really put using complex anaglothes in a 4 minutes song? How many of the 50 megs of a wave file or 4 meg in a mp3 isn't really used?

    There is one good thing, with effective encoding, it can increase security for simple text messages.

    =)

  • Why should i use SDMI when i already have MP3!
    It is too late for them to jump on the wagon.

  • Let them declare it secure and try to implement it, but several of the member organizations refuse to implement it, and watch SDMI get clobbered in the marketplace.
  • I believe part of the protection is an audio watermark which would not be eliminated by your solution. It would defeat any other protections though as far as I can imagine.
  • The fact is, there isn't even really an need to defeat the watermarking. Free unhindered (aka SDMI-free) players will always exist, and it's trivial to re-encode *any* audio file as an unhindered format (mp3, Ogg). Once SDMI happens, people will port and write GUIs for mpg123, LAME, etc. for Windows, and life will continue as usual.

    There's no need to crack SDMI when we can simply ignore it.
  • Well, look at the source.

    Slashcode is currently distributed under GNU GPL 2 [slashcode.com], which allows modification and (apparently) ASPing (using code to run a service without distributing binaries) without requiring modified source to be disclosed. GNU GPL 3 will have restrictions on ASPing, which <IANAL>may be construed as a public performance under copyright law</IANAL>.

    Slashdot is presumably running a highly customized Slashcode installation. Fat chance you'll find lameness filters in the tarball [sourceforge.net].

  • Not quite. As I understand it, the watermark stops the playback. There is also some scheme where the streaming audio or other code tells the hardware that "this watermark is ok right now" (otherwise it would be impossible to play the original).

    But your scheme is workable, while what I described will never work, because destroying the watermark is much easier than creating a legal one. The problem is that nobody can make a recording without sending it to the RIAA to be "stamped" (no local device can stamp the watermark, even if it checks for an existing one, because that reduces cracking to the ability to destroy a watermark again).

    This means nobody (like an independent band) can record music! Of course this is the goal the RIAA wants ultimately!

  • Anybody manufacturing a device or system that can run an end-user algorithim capable of translating stored bits into audio/video will be declared illegal. This includes Linux and any open-source software, all hardware with documentation, and any closed-source language that can control the audio any finer than "play this song".

    This is not a joke, and is of course the real reason that all computer professionals fear the DMCA.

  • No he's not, but thanks for remembering!

    I haven't trolled in a while; lately, it's been hard to compete with the real Bruce Perens!
  • by Dr. Evil ( 3501 ) on Wednesday November 08, 2000 @06:00PM (#637132)

    What if the Watermark contains information to the effect of:

    "Purchased on 11/09/2000, by g_mcbay. By listening to this music, g_mcbay agrees that he/she will not copy this music. BTW, his credit card number is xxx111222333"

    If that gets all over the world, you could be tracked down and potentially held responsible for the unauthorized duplication of the music. So how do you ensure that the message is scrubbed clean without degrading the sound quality?

  • No matter what the folks at SDMI come up with, it will be circumventable: it is intrinsically impossible for watermarks to be secure.

    The real problem I see is that SDMI will probably also get erased by accident by increasingly good compression technologies. What is going to happen then? Most like the music industry will scream "bloody murder" and be all up in arms about better compression standards (as if they weren't already), not just because they make distribution of music easier, but also because they erase the SDMI watermark.

    In fact, a particularly cynical view of all of this would be that SDMI is intentionally weak in order to be able to have a future claim, based on DMCA, against the deployment of better, or at least alternative, audio compression techniques.

  • Would this lockbox be camoflauged with liscense agreements also? You MUST remember that the key to success is strategery.
  • Ok, lesson here is... if you can encrypt it, someone can break it. Plain and simple.
    Yeah, and I think they've learned it too. This looks like a face saving exercise to me. I mean even SDMI insiders don't believe it. From the Salon article:
    "There's skepticism inside my industry, because we weren't involved in these later phases of the testing," says one SDMI participant.
  • by mikej ( 84735 ) on Wednesday November 08, 2000 @01:23PM (#637136) Homepage

    I have less and less faith that people like those behind SDMI, the DMCA, Library/School filtering, etc. can loose. Yes, thus far people with reasonable, intelligent, knowledgeable positions have been able to hold all that money in check, but I just don't see how that situation can continue. What isn't technically possible _will_ be legislated into effect by people with the resources and desire to see it so.

    What those who rose to the SDMI challenge did, if I'm to understand the implications of the end to the DMCA commentary period correctly, is now a felony. It is my understanding that even the Princeton team, a legitimate academic research effort, put themselves at risk of ending their careers by participating in this overtly sanctioned exercise in reverse engineering.

    If the mind-blowing amount of money behing initiatives like SDMI can't create a technical solution, you can guarantee that it will realign to bring about a legislative solution, and once that's done, that money will move toward financing enforcement. The truly sad part is that we're already moving into the enforcement phase, and neither of the two possible next presidents have displayed any willingness to curb the trend. As the subject says, SDMI will win, not because of its technical superiority, but because there's too much money working to guarantee that it does.

    I've been a cynic for a long time, but I've never seen so much to be cynical about as I have in the past year on the internet.

  • by delysid-x ( 18948 ) on Wednesday November 08, 2000 @01:30PM (#637137)
    They're going to watermark CD's? Does that mean they'll want everyone to fill out a form and agree to the ToS at the record store?
  • by Fat Rat Bastard ( 170520 ) on Wednesday November 08, 2000 @01:35PM (#637138) Homepage
    Theoretically the watermark will survive re-encoding. It is nothing more than an audio signal that is put in a part of the spectrum that will cause the least amount of "damage" to what we as humans can hear (probably not the best explanation, but the best I can do right now). The theory goes the more you distort the file to destroy the watermark, the more you destroy the "good" stuff as well (you really distort the music to the point that its noticable). That's the theory anyway. Assuming that you cannot destroy the watermark (doubtful IMHO) they still have a huge problem. So what if the songs I have have a watermark. It only matters to SDMI aware programs/hardware. The RIAA may be able to strong arm the consumer electronics firms into producing SDMI compatible equipment (thru crap laws or pictures of Sony's Prez with a goat or somthing) which will slow things down for a while (and the CE companies will fight tooth and nail... they know the consumer HATES things that complicate their products) , but it should be dead easy to come up with a program that plays thier format and totally ignores thier watermark so you can still play SDMIed music on your computer care free, and there are quite a few do it yourself stereo component and portable units that hobbiest can build.
  • The security of SDMI depends on would-be pirates having exceptionally high standards for sound quality. Given the quantity of 128 Mbit mp3s on napster, I think it's safe to say this is not the case.
  • I believe the way it's actually supposed to work is that you have to make a special audio driver for Windows that has to be cryptographically signed by Microsoft. The driver will not allow capturing the output to a file. SDMI applications will ONLY work with these special audio drivers. So not only can you not output to a file, but you can't directly hack at the driver, since it would no longer fit the digital signiture.

    So it's hypothetically stopped at the SDMI-level, not the .wav level.
  • by Chris Johnson ( 580 ) on Wednesday November 08, 2000 @06:45PM (#637141) Homepage Journal
    Not to mention that anyone who can hear the difference of removing a watermark of this nature... could plainly hear the sonic damage the watermark itself causes... and very likely could hear the difference between CD and, say, 20/48 or 24/96 digital.

    If it wasn't for the fact that all freely accessible music formats are apt to be declared illegal I'd _love_ the idea of these clowns going ahead with SDMI. I can tell you that it is going to be _noticable_ if you have an ear- perhaps less so if you are 'watermarking' Britney Spears junk, but anyone who is getting a good sound will find that sound _defaced_ by the watermarking. That's not all- radio stations have elaborate equipment to compress and enhance detail on the music they play. Played through that even the Britney Spears stuff will be obviously flawed by the watermarking- it will bring out the distortion and make it audible, that is what this type of equipment is _for_: bringing out hidden detail in sound.

    There is a Chinese ideogram (?) which represents both danger and opportunity. This SDMI garbage is just that- both danger and opportunity. There was a time when major label/corporate musical content actually was better than garage stuff- studios were paid for, artists got to concentrate on their work, and a lot of music got created that was really rather good. That's why you're still hearing it 20, 30, 40 years later instead of last year's corporate music product.

    That time is gone- now, with SDMI, the corporate music product is boldly choosing to degrade the quality of its product to _substantially_ below what a clued electronic musician (with some sound engineering experience) can produce. That's because the corporate people think they have such a lock on media in general that they can _afford_ to do this to tighten their control- and that is the opportunity.

    It's never been a better time to become a musician- not because there is industry support- there's not- not because there's money in it, there has never been money in it compared to, say, going public with a dotcom. The reason it's such a good time to be an indie musician is because the main competition, commercial media, is becoming so arrogant that it no longer cares about any sort of quality. This tends to alienate people, and there are going to be a lot of alienated people milling around trying to find music, entertainment, stuff to listen to or watch or even stuff with a message and a purpose. It's simple mathematics- as the corporate product gets complacent (check), lower in quality (check BIGTIME) and cynical (check), a market opens up for competition to come in. Straight capitalism- capitalism cuts both ways *g*

  • why does it need an *encoder* to make one, and a *decoder* to play one?

    All compressed data is encrypted. It HAS to be to compress it. Think about it for a minute.

    The key issue is that for mp3 the key is *public* rather than private.

    KFG
  • People won't want low grade audio and Napster will never take off.
    What the SDMI people forget when testing for perfict audio is that they are making a protecting against MP3 piracy.. This will have zero impact.
    Accually ANY piracy would degrade the audio somewhat.

    So golden ears can tell the diffrence while partly tone deff me can't tell the diffrence..

    Someone pointed that SDMI will be flawed but the music industry will just get laws past so it dosn't matter.. Someone else pointed out (to me in RL) that with the United States ellections so close (In all offices) that we are likely to get a pritty much even mix of partys we'll end up with 4 years of bickering and political infighting.. no new laws.. and nothing gets done. So if the SDMI stratagy is to get a new DMCA type thing passed.. Good luck..
    Basicly it's not so easy to buy people.. buy republicans and the democrats will oppose you on princaple.. and visa versa.. you can't buy em both...
  • Nothing is wrong with paying for music. Granted, there is a lot of
    overreacting that goes on: some people really come across as though
    they believe that if A) someone creates something, and B) it's really
    easy to copy, then C) it must be made freely available to one and all.

    But that's not the issue here. The issue is that a lot of
    very--temporarily? :)--powerful people and organizations are
    attempting to apply laws to a new technological and sociological
    foundation, and that same foundation obsoletes many of those same laws
    and concepts. They have their heads so far up their assets that they
    don't see that this desperate attempt to make old models work in a new
    world is doomed.

    Perhaps the worst part, however, is that they're foisting the whole
    load on the world as being in the interest of the artists. This
    hypocrisy is what really condemns them for me. Since bloody *when*
    have artists meant a sparrowfart in a hurricane to these execs? They
    matter when they have a lucrative track record. That's it.

    If you must pity someone, pity the artists. They weren't getting
    treated what they were worth before, and they aren't now.

    And please please please don't bother mentioning any of the vast
    minority of artists who make it to the top rung. Sure, they get big
    bucks and all the extras. You only know about them because they're
    making money for someone else. Who do you think writes the press
    releases, pays the studio/engineer time, yada yada? The execs. Why?
    'Cause they'll make a bundle.

    There are labels which buck this trend, but they're for the most part
    quite new and have grown out of the underground/independent
    scene. Which, by the way, is taking full advantage of the same
    technology which the Big Boys are trying to suppress. Independent
    music is flourishing, since creating and distribution of one's own
    works is more available than ever before. Yes, this results in a lot
    of drek. But at least with independent music, *you* get to decide what
    you want to hear. You don't get your music selected for you by suits
    pandering to market pressures. Think they want that pressure? Sure,
    it's not a huge chunk out of their pockets, but the competition *is*
    there, and lots of studios, bands, and labels are popping out of the
    woodwork with independent/semi-independent works which are just so
    much better than anything you ever hear on, say, RCA. Godspeed You
    Black Emperor, Tortoise, Neko Case, you name it. The execs don't like
    this either: competition sucks when your suit costs more than your
    PC. :)

    Eventually, with any luck the music industry will simply adapt to the
    way things are now, instead of the way they wish they were. But for
    now it's gonna suck for a bit.
  • Watermarking is adding details you can't hear.. Audio compression is REMOVING details you can not hear. Assuming the anolog cables and sound card DAC and ADC don't strip it first the compression should.

    It seems to me the SDMI is totally based on identical reproduction.. do anything to elinminate that and you lose the watermark in the process
  • If anyone ever breaks RSA-4096 encryption, I will be very impressed. A little less if they used a quantum computer, but quantum computers themselves are impressive. . .
  • A 2-1 vote? this is something so subjective i don't see why it matters except for the sdmi to use to make itselft feel better. I mean just what is considered "minimal loss" or "no apparent loss" of quality?
    didn't the parc team that cracked it say that the online testing "oracle" wasn't quite working either?
    personally i could care less if the audio quality degrades a little for the convinience.
    do they really think they are going to deter the masses from sharing music with this technology? even if no new mp3s can be ripped what about all the existing millions of mp3s already out there?
  • by Masem ( 1171 ) on Wednesday November 08, 2000 @01:45PM (#637148)
    As an earlier link to the SDMI thing, I remember reading that the sound engineers that were selected to test the quality were all from RIAA organizations. And of course, RIAA wants the cracks to fail.

    What's odd about this is that we have a means to break SDMI and produce a file which probably has excellent (given that the people to submit said cracks would be sufficiently happy with their results), but not quite excellent (failing the golden ear test), but free of copy protection. When it comes to "distributing" free music, what will the average user of such services look for? I'd argue that only true sound affectionados would be the ones to get the CD given the option between it and digital music files, and they'd be the only ones that could hear that difference that the golden ears tests revealed.

    Basically meaning that since it can be hacked to remove the watermark, SDMI is pretty much defeated.

    Save for that stupid little thing we call the DMCA.

  • What I don't understand, is why would anyone help the music industry in this fashion? If you break SDMI, the music industry will simply replace it with a stronger, better solution, and we will all lose.
  • Good Point, which begs the question:

    Couldn't the DCMA be challenged legally on the basis that there really is no such thing as an 'effective access control' device in purely digital content?


    "A microprocessor... is a terrible thing to waste." --

  • by PeelBoy ( 34769 )
    This isn't going to stop people from listening to mp3's on the computer any way right? I mean.. All you have to do is save an old copy of mpg123 or winamp and you can listen to all of the mp3's you want..... I would think....

    What are they going to do? Force an open source mp3 player to check from their water marks?? haha..

    I guess the only thing they can really do is force the companies making portable mp3 players to use this technology.. That kinda sucks, but oh well.. I personally don't use them anyway. I'll just burn them to a cd instead..
    -----------------------
    Jeremy 'PeelBoy' Amberg
  • to tkae it one step further.. can we lock Britney Spears in a box that only the president and speaker have a key to?
  • > Can't we just have Britney and Christina sign a XXX-Porn contract with vivid video so that we can all enjoy their 'talent.'

    Not if we want to keep the boxen locked ;-)

  • What if you make one backup and then your original is destroyed? You have the right to make another backup but can't. Voilá! Fair use out the window.
  • Yeah. That's the whole point. The SDMI has to lie now or else they can't lie later. SDMI is cracked (and mathematically we already know from information theory that you can't do what they want to do). A secure system is impossible. They know it's not feasible so they have craft out these early lies to support their later lies when they go before Congress and ask for more restrictive laws and when they go before a judge and ask him to confiscate joe college student's computer and audio equipment plus levy a steep fine because joe knows how to make copies.

    --
  • by iamsure ( 66666 ) on Wednesday November 08, 2000 @02:47PM (#637156) Homepage
    It seems to me based on the Salon reporting, the MULTIPLE universities and other groups that claim to have cracked all their watermarks, and protection schemes that they are fibbing.

    Maybe they have some cute little exception (cant be reproduced on a p100, doesnt sound the same to golden-ears after the fact), but it seems like a fib or a stretch at LEAST to me.

    So, what if they are fibbing?

    More power to them. Let them release a flawed product, get everyone's support, have it added to a million products and songs, and weeks after release have a winamp plug-in come out that real-time decodes them.

    Suits me just fine.

    The honest, appropriate, and correct solution to the problem of digital security is to not be militant about it.

    Sure, anyone can copy cassette tapes, and lots do. That didnt stop PLENTY of cassette sales.

    You say its different because its digital, but it really isnt. The general populace doesnt have the knowledge, time, nor toys that support mp3's in a wide-spread way yet.

    Not to mention I dont think it will become super-widespread for another 3-4 years.

    (Yes, I know napster has a large user base. Thats not the same as the user base of people with cd-players (home, car, personal, AND computer) now is it?)

    In short, the media giants need to just tuck tail. Its a losing battle. Mp3's sound more than decent, and are not secured. They will always be around now. If the music companies had gotten on board sooner, and done digital distribution sooner, they may have prevented it.

    All they can do now is try to save their ass.
  • Perhaps "stating" was meant. I understood the poor editing when /. was a noncommercial entity produced by the grace and kindness of Malda's and Hemos' hearts but now I wonder if the editors, even though they should have the time (and money) now, do not have the skill to produce quality work.

  • No, on the inside front cover, in small print, it will say:

    "By opening this package, you aggree to be bound by the ToS. For a copy of the ToS, please write to..."

    No need to go bothering with a form when they can simply trick you.

  • There's no need to crack SDMI when we can simply ignore it.

    Only a limited set of people can effectively ignore it. Remember that not everyone will be able to get the software needed for those older, non-SMDI-crippled formats, particularly if there's an effective effort by commercial software houses and equipment manufacturers to stop supporting them. Many /. readers may be able to download and compile their own Ogg player for their computer, but how many of them would be capable of hacking their portable SMDI player to play Ogg files? I'm not sure I could if the manufacturer was actually making a reasonable effort to make it difficult, even with good instructions. How much less so the general public, many of whom are uncomforable even with the relatively simple binary software installation available today? Remember that the RIAA doesn't need to completely stamp out music sharing, just knock it down to the point that they can continue to profit from the people who can't leap the higher technological hurdle that SMDI could impose.

  • While lossless audio would be great...no one will leave the mpeg format for a version you have to pay for..at least not for long. SDMI is a waste of time. While direct digital copying is convenient, and doubtless any means of securing a file will be circumvented very quickly (and thousands rush to the OS that does it firstand makes it easiest. But a couple alligator clips and i can bypass absolutely any technology SDMI throws at me, and re-encode it. Sure, sound engineers will hear it, but by the time i get it into .mp3, the difference won't be appreciable. SDMI can't possibly deny this. Now as for that lossless audio compression... I suppose the first corporation to release that product and make it not secure, and either dirt cheap or free...will become very famous and very very rich.
  • I seem to remember reading that the "Golden Ears" test for the SDMI challenge simply required the "hacked" songs to sound better than a 64-bit MP3. That seems like a pretty reasonable standard to me. I'm not too picky, but anything under 128-bit sounds like crap.

    All you people screaming at the RIAA for their supposedly bogus Golden Ears test should calm down and take a few breaths :-)

    Granted, I don't see the point of watermarking, period. If watermarking is used to control playback, you can always convert to a non-controlled format like Ogg or MP3 (through analog, if necessary). If watermarking is used to trace whoever first "steals" music, someone will just buy the music with fake ID, post in on Napster/Gnutella/Freenet, and then the RIAA will have no recourse.

    Can somebody explain to me how watermarking is actually supposed to stop piracy (even if it isn't broken)?

  • Suppose you have two copies of the same song, both carrying a watermark, but different ones. Suppose you substract one song from the other. The bits that belong to the song should delete each other, and the bits that belong to the watermark and that are different in each watermark should remain. That should give you a pretty good idea how and where the watermark is in the song.

    By flipping these bits randomly you should be able to perturb the watermark beond recognizeability without doing damage to the song beyond what the inital compression has done.

    Currently, the crack attempts had only one copy of the song, and one watermark, to work with. How much easier will it be PACTOR style with two or n identical copies of the song, each with different watermarks?


    © Copyright 2000 Kristian Köhntopp [slashdot.org]
  • I think you're right. No matter what, RIAA will never recognize a watermark scheme to be broken. It's not a technical issue here, it's marketing, politics and FUD.

    It's a bit like: suppose we'd chop off Hillery Rosen's arm, she'd still claim she has two arms.

    The contest was boycotted, could it be that the real hack wasn't exposed to the RIAA?

    And those golden ears, aren't these people paid to reject any hack posted? They even think that the watermarked songs were bad quality, so how would they determine songquality?

  • No they will use your new American "digital signature" law. As far as I can determine this does not actually refer to digital signatures as we understand them (X.509 or PGP certificates) but rather "click here, OK you just legally signed this."

    So look out for some sort of simple gizmo, or maybe it'll get incorporated into a point-of-sale credit card PIN system or whatever. ("For your protection" of course.)
  • You saw that bit on slashdot on securing your hardware designs so that they cannot be reverse engineered without breaking it to pieces etc.?

    what if the RIAA requires that all this SDMI stuff is implemented in hardware, under an NDA and protected from reverse engineering in the manner above, well have quite a problem on our hands, wont we?

    This is of course assuming that no-one will ever release PC software to run this stuff, which they probably will if there is a consumer demand, and as we all know from the DeCSS case, this is the weakest link in any access / copy control scheme.
  • by overshoot ( 39700 ) on Wednesday November 08, 2000 @01:55PM (#637166)
    In an SDMI world, your soundcard would refuse to play the new .wav because it still has the magic mark of Cain. Likewise, your video display will only display approved images, etc.

    Yes, I know: this whole scheme depends on having every single manufacturer of electronic components and systems play along. That's what the DMCA is for (and the recent FCC decision requiring that TV sets do "rights management.") It's Part One of the move to make manufacture of non-SDMI equipment illegal.
  • IIRC, an SDMI "protection" mechanism is cracked if an application or script can alter the file such that their watermark detecting software cannot detect the watermark, it is reproducable, and their "golden ears" determine that the sound quality has not significantly deteriorated.

  • by Sara Chan ( 138144 ) on Wednesday November 08, 2000 @02:07PM (#637173)
    The most important point was made by the Princton team in their FAQs [princeton.edu]:

    All hacks to SDMI attempted so far have been made without access to the watermarking algorithm. If SDMI is ever released to the public, however, someone will reverse engineer the algorithm--and post it on the web for all to see. As soon as that happens, SDMI will almost certainly be cracked more or less completely. The current contest wasn't at all close to a real-world test.

  • by vees ( 10844 ) <rob@vees.net> on Wednesday November 08, 2000 @02:54PM (#637175) Homepage Journal

    Has anyone ever had the chance to listen to some of those ear training tapes that sound people listen to to get that good? I listened to one once as it went through a series of sound bursts of 3 seconds through 1 millisecond. Past half a second, they all sounded identical to me. Then there was the test where they raised a certain frequency a few dB above a noise floor, at 50 Hz, 100 Hz, etc. all the way up to 22KHz. That sounded like a 2400 baud modem played backwards.

    And yet, my friends in the professional sound field can hear these minute changes in the quality of the sound and correctly identify each one. That's why they get paid as much as ninja Solaris admins. They can't listen to anything less than digital to the speaker theatre quality sound without cringing. Me? I like MP3s and AM radio. So much for the golden ear test. Now back to my Rio.

    --

  • by i-Chaos ( 179440 ) on Wednesday November 08, 2000 @03:00PM (#637177)
    When was the last time internet legislature actually secured anything? Don't tell me that you're completely blind that "warez" site that you KNOW exists. Don't tell me that you're unaware of the existence of FTP sites running on OC-3 backbones massively transferring pre-release games and microsoft betas. And lastly, don't even think about saying that you've never seen a file called "class.nfo" or "myth.nfo" Well, if you really don't know what I'm talking about, then you should reconsider your post, as you obviously don't have enough information about the topic in question.
    We're talking about securing music files to rid the world of internet DIGITAL music piracy. Let me just say that the only piracy protection on games that the "Release Groups" have not been able to crack is the logged reg-key. Logged reg-keys are stored remotely, and every time a game - for the sake of argument, let's use Quake 3 as an example - is played (over the internet only) there is a check for the reg-key. If the reg-key which the user entered into the game is in their file of "released keys", then the user is allowed to play, if not, then the user is not. Besides, Quake 3 has been cracked to work with single-player. What can SDMI do? Force only internet-connected users to listen to music? Ha! That's a laugh. Anyway, good day.

    Oh yeah, a note on "resources"... umm... one would think that MR Gates has LOTS and LOTS of resources, yet a lot of people use pirated Windows - just a thought.

  • by mangu ( 126918 ) on Wednesday November 08, 2000 @03:03PM (#637179)
    To see how much those "golden ears tests" mean, take a look at rec.audio.high-end. It's not those very few people who are naive enough to spend $6000 for a pair of "oxygen-free copper" speaker wires who matter to the music industry.

    The majority of people who buy music are those who are already used to the degradation caused by broadcasting, people who listen to audio cassetes in noisy cars, etc. As long as the music passes "tin ears tests" it's good enough, and the RIAA knows that.

  • by Jafa ( 75430 ) <jafa@markante s . com> on Wednesday November 08, 2000 @12:44PM (#637180) Homepage
    Everyone was trying to boycott the challenge earlier, thinking that if we let them release, we'll break it after it's official. Then some people broke it (for the most part. Not forgetting that it's impossible to secure anyway). Now, they're saying it wasn't broken and are moving ahead anyway! That's the impression I get.

    Sounds like a good deal to me.
    Jason
  • The really dedicated audiophiles (no, not the type who measures the quality of his speakers by their price and then puts them in opposing corners of a room) probably doesn't listen to the music that is most prevalent on napster (like 'top of the hitlist'). After they spent like $10000 on their audio equipment they'll happily pay another $50 for some japan-import-CD.

    For most of todays 'top hits' it doesn't matter anyway if audioquality is slightly degraded and most people listen to that music as background to something else, like driving, working, chatting, partying etc. Under these circumstances audioquality doesn't matter too much, especially since with the audioequipment it is played on the difference is probably inaudible anyway.

    But if the RIAA needs the illusion that noone will copy their music because it's slightly altered to pull through their SDMI scheme I'm just happy to let them proceed with it and fail.
  • Is it abuse-windows-users day today?

    On Slashdot, every day is abuse Windows users day
  • ... because maybe they'll decide that it's good enough, and people can then go through and rip it to shreds three weeks after they standardize on it and release it. Once it's out, perhaps there's a rat's chance in hell of proving that it was faulty technology in court and getting the court to rule against the music industry if they try to sue.

    "Titanic was 3hr and 17min long. They could have lost 3hr and 17min from that."
  • seem to be:

    1. Watermarks can never provide adequate security for music (or video) because they're necessarily irrelevent to the analog signal contents, which can be recovered without them.

    2. SDMI is an unworkable battleground of the RIAA versus all the HW/SW players, where gridlock will reign for years, and technical reality will eventually trump rearguard lawyers.

    3. The SDMI "challenge" failure is being stonewalled and spun by fools for RIAA purposes, but they're _not_ fooling anyone who understands music and the bankruptcy of the RIAA.

    4. Nonetheless, RIAA controls SDMI (dollars are clout), will declare victory, retreat to an illusion of security, aided and abetted by Micro~etc, to control the masses (for a little while).

    5. SDMI is Evil Tech(c) that is inevitably doomed to fail because it flies in the face of both physics (in the form of information theory) and plain common-sense (mp3 is good enough).

    6. But don't explain this to the RIAA's fatcat morons just yet - wait until _after_ they commit their future business models to this flawed, hopeless scheme - then, take full advantage.

    The MPEG / Fraunhofer / Ogg standards look like a clear case of the technicians sticking it to their corporate masters by defining clean interfaces not amenable to money-grubbing big-company monopolies. Way to go, guys & gals! The best part is that they've been shot throught the heart, but they'll never see it until their business models just keel over and die.

    If I can send an artist (or band) $1 to download a whole CD, that will be just as much money as they'd get if I bought it from a RIAA distributor for $16. I'll make the trade and, more importantly, so should the artist or band. The leeches losing out are unnecessary, inefficient, passe' overhead. Labels are dead, now celebrate artists! Look forward to media freedom!

  • by gotan ( 60103 ) on Thursday November 09, 2000 @02:34AM (#637189) Homepage
    Well, it would be a bad idea for Microsoft to raid all that people and generally prevent them from using an unauthorized copy of windows. It surely would be easy for them to scan the net for duplicate registration keys (we all know that they could coax that kind of information out of any IE visiting one of their websites) and thus gather enough evidence.

    But they would loose more than win, many people would abandon windows and use alternative OSes, and once they use them at home they could use them at work too ... and that's where MS gets the real money for their OS: selling licenses and training to all those employers equipping tens to tenthousands of computers with it.

    For games it's a little different, by now the Softwareindustry has learned the fact, that any software selling millions of copies (games and popular tools) will have it's copyprotection cracked sooner or later, so they calculate to make their revenue in the first two or three months after it appears on the market (that's why they have to hype the product so enough people will rush to the store and buy it the day it comes out).

    For the music industry neither of these arguments work: they loose more than gain from anyone grabbing their music for free, and once SDMI is cracked free copies of music may hit the net instantaneously after release. So for the music industry with their current business model (make the main income from selling copies of music) it's a simple equation: each 'pirated' copy is one copy sold less (a more realistic calculation would be more like 10:1) and so they will drag everyone they deem worthy of sueing to court (probably down to the student who shares his music files with the whole university) to frighten people from 'pirating'.

    What good that will do them remains to be seen, maybe it only helps to create a free music scene, like commercial software bothered enough people to spark initiatives for free software, and as there can be money made from free software (with good documentation, training and support for example) there could be money made from free music as well (with fan articles, advertising, and concerts for example). It would be less money altogether, but OTOH there would be less overhead (mainly distribution and marketing) too, in the end the artists share might even be bigger (and that's what the music industry most cares about, the rights of the artists, let's not forget that).
  • by danderson ( 157560 ) on Wednesday November 08, 2000 @02:16PM (#637194)
    Why should i use SDMI when i already have MP3!

    (If you live in the US: ) Easy. MP3 will be found to be an illegal bypass of the security measures found in SDMI and will be declared illegal. So will the CDs you own. And any tapes. And the concept of Fair Use will be thrown out. Just prepare yourself

    (If you don't live in the US: ) Try not to laugh too hard at our stupid coporate laws.

  • by Anonymous Coward on Wednesday November 08, 2000 @03:05PM (#637199)
    Of course, there's another translation available:

    ...successful attacks were not identified on three technologies, and were identified on two. Of those apparently successful attacks, one of them was not reproduced on additional music samples as part of our evaluation process.

    Neatly morphs into...
    "Despite our best efforts, it appears that all 5 encoding methods were cracked. We could not figure how people did it on 3 of the methods because they didn't send the program.
    On the two groups that were kind enough to send their program, we could only figure out how to use one of them"
  • I predict that SDMI will never be broken.

    Now matter how many people actually break SDMI and no matter how good the audio quality of files so broken, it will never qualify as broken to the RIAA.

    Why? Because they want to have a "secure" standard that nobody could successfully break. (Regardless of the facts.)

    They did their part to make a truly secure standard. After SDMI is released and music starts getting pirated, then they can use the DMCA and cry, "look, we spent millions building a truly secure system that had industry support and those evil hackers broke it". This is a violation of DMCA.

    In a nutshell, they have no intention of stopping piracy through purely technical means. SDMI is just part of what they need to fight piracy through the only means they understand -- litigation, money, political corruption, lies, etc.
  • In non-independent tests avoided by the majority of people with taste buds, 3 out of 5 cola non-skilled cola hackers report that they can't tell the difference between SDMI and MP3 music.

    The industry funded RIAA reported that this conclusively proves the existence of life on Mars, and will proceed with plans to produce Colas that will sound the same to Martians and can't be cracked for their recipes. No Martians could be found who could crack the recipe, according to RIAA.

    Rumors that there are no Martians, that colas don't work in low-pressure atmospheres, and that you will never make a profit when people drink the free Open Source cola rivers on Mars were all reported to be just rumors, according to the news media who depend on insider cola event tips and free cola concert tickets from RIAA.
  • by g_mcbay ( 201099 ) on Wednesday November 08, 2000 @12:47PM (#637208)
    The 'golden ears' tests are what make me laugh the most. Haven't these people ever downloaded an MP3 from Napster? Even I can tell that the quality is fairly poor on many of the MP3s people host..Yet, it doesn't seem to deter the masses.

    It is incredibly naive of them to consider a hack on SDMI unsuccessful because professional sound engineers could hear the difference in the watermark-hacked version!!! Especially in the case mentioned in the article where it was a 2-1 vote, meaning one of these professional sound engineers out of 3 didn't hear the distortion.

  • by xeno ( 2667 ) on Wednesday November 08, 2000 @12:49PM (#637211)

    I'm not sure there's real news yet: The SDMI proclamation and the Salon reporting is just a war of words at this point. What will be of real significance is when an SDMI format is selected, files becomes available, and can be played by commercially available devices. THEN it will be significant if there are cracks of the chosen SDMI format.

    imho, I don't think that the people motivated to produce the best cracks (and to build gui crack tools, which are what would do the real damage to SDMI) are also motivated to share the results with the SDMI folks. The real news will be whether successful, reproducable cracks and crack tools become available immediately after the SDMI release.
  • Congratulations, then. Time to call it a success and to implement SDMI, isn't it? I'd love to see them say that as their final opinion. SDMI is flawed and they know it. I'd rather they implement a flawed technology than we can handle than to come up with something even more wretched.
  • I don't think it would be so difficult, once the industry relies on SDMI watermarking. If for example Sony sold a song to me, they would have an unmarked binary of the song on their server. If I bought that song, they would mark that binary, and ship it to me via download.

    Now, if a second person bought that binary, that person would get the same binary bit for bit, but for the watermark.

    I'll bet two identical copies but for the watermark would not be so hard to come by, especially for the popular songs.

    The inital question still stands: Does having two identical copies (but for watermarks) help erasing the watermark?

    © Copyright 2000 Kristian Köhntopp [slashdot.org]
  • In case no one's mentioned it, the Ars Technica [arstechnica.com] run down on how SDMI is cracked:

    ...the Princeton results? This bit on IDG.net [idg.net] clears things up quite a bit. Check it:

    "Our focus has always been on the scientific question of whether the SDMI's technologies, if deployed, could be defeated by pirates," the statement read. "We demonstrated that they could be defeated, by making small modifications to the music files so that the watermarks were no longer detectable but the sound quality was still acceptable. "Instead of the scientific question, the SDMI has chosen to focus on who is eligible for the cash prize that they have offered. Since we chose to forgo the cash prize in order to retain our right to publish our results, we understand that the SDMI no longer considers us to be entrants in their contest. Their announcement regarding their contest does not invalidate our scientific results."

    So it looks like the Princeton hacks weren't counted. Furthermore, the Princeton team will be releasing their findings to the public, so if one of the "unhacked" technologies gets picked then info on how to defeat it will soon be public knowledge. I'm sure SDMI thinks they're going to sue under the DMCA to shut Princeton up, and I hope they do. It'll make for a great test case for this unconstitutional bit of legislation.

    --
  • How are you going to ensure that people only purchase using credit cards?

    As long as you can walk into a HMV and buy a CD off the shelf, using cash, then it's going to be untracable who bought the 'original' copy of the media.

  • Absolutely true, but think a few years down the road when high-speed wireless access begins to creep into home stereo systems... sort of like digital radio on speed. Kick in micropayments, consumer profiling, the DMCA and encrypted streams. Although something as primitive as creditcard information would probably not make it in to the stream, some identifying information might.

    On the upside, you'll never actually own the song, you'll just pay $.03 every time you want to listen to it. (recording it on your analog player will be illegal, and the watermark will contain information which makes any digital recorder halt when trying to record.)

    I don't think these guys are worried about the next five years of home piracy, the general population still prefers to have CDs. I think they're trying to set themselves up for a whole new marketing model.

  • Quoth the poster:
    The FSF rep wasn't able to respond to this, but from my point of view, SDMI's ability to make a limited number of digital fulfills the "free speech" needs of the FSF, which was their main concern.
    This is exactly inverted from the purpose of the original intent of copyright law, which was to give the creator of a work a limited monopoly on its use after which it would pass into the public domain--it was never intended to limit the ability of the user of a copyrighted work to make copies for his/her own use (never mind right of first sale, etc). Copy protection of this sort has always been used as an end run around fair use.

    If this kind of thing doesn't give you pause, then you should check out Pamela Samuelson's excellent article [negativland.com] on the subject...

    -- Shamus

    Pass It Along [chumba.com]
  • I wonder why images.slashdot.org just sent me a PPTP DoS packet? I'm running a personal firewall on my machine here, and this is what comes up:

    ht tp: //advice.networkice.com/advice/Intrusions/2002901/ ?magic_cookie=2f312e31 [networkice.com]

    Is it abuse-windows-users day today?

  • Couldn't the DCMA be challenged legally on the basis that there really is no such thing as an 'effective access control' device in purely digital content?

    Are you confusing "effective access control" with "perfect/absolute access control"

FORTRAN is not a flower but a weed -- it is hardy, occasionally blooms, and grows in every computer. -- A.J. Perlis

Working...