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MQA - A clever stealth DRM-Trojan

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thank you very long who would come to Chris of a mom and unsocial easier thank you the yes I think you know this is a bit intimidating large space and have everybody's on the topic of this talk is a new audio format called and QA on master quality authenticated else as the title of our talk suggests it's more than just an all format and but in order to explain how we arrived at the title a clever still steering and Trojan so we have a lot of ground to cover of and on top talk structured as you see here so I'm going to talk a little bit about what you find in all your files and ontology is going to explore and examine some of the claims of that are being made about master quality authenticated and then we'll move on to 24 bits cut some room to spare to have a look where they actually height the idea and and finally only going to make some remarks way we think of intrasexual actually quite clever the so the weight so it's good to be back here and some of you may know me already a sensible at the conferences couple times before and mostly on policy a related issues on identification of 2 identification and authentication related issues this time we have to make a confession i am an audio file and I believe that this cable sounds different
than this cable so I should be
a millionaire known as some of you may know that the James Randi Educational Foundation had offered a million dollars to anybody who was able to identify the difference between 2 all interconnects like
these ones in a controlled ABX testing of here is a 10 year
old with a report on this challenge of course nobody managed to find these differences in Windham a million million-dollar the and I'm pretty sure I would feel at the test tool but in my own experience if I put 1 of these cables and the system for equal to in that and then the other cable some for another week there will be some preference that emerges to and they cannot explain that tonight uh and um but I guess if you asked me to 8 weeks and
mattress this up differences in text and softness but it will be noticed by me by just laying down on them but if I get to sleep at each of these metrices full week go so I might develop some sort of preference I make this point here and I'm sure I'm told who more on the object of side of things when it comes to you feel to be skeptical about it but what I want to illustrate is that we're talking about a market the when it operates and exploits the limits of perceptibility and where environmental habitual factors play a role In watching sense and what you notice in a belief that certain markets have developed drop those perceptible limits and exploit something like a long tail phenomenon in a distribution of perceptibility among humans In other words in a saturated consumer Detroit's tonics market they are a certain class of devices which offer a just noticeable differences and these can be commercially attractive in command premium prices To illustrate this point further let me ask you pull off you here is a game of quite a few OK so how
many of you have a 240 hertz money toward move to OK common you if you
have a high polling rate mouse quite a few more you the
do you believe this makes a sorry this makes a difference in you gaming experience OK the sole object to this year skeptical people OK but some values like to 140 hertz refresh rates are astonishing high initial tell somebody 20 years ago that people able to discern 60 hertz refresh rates from 100 hertz refresh rate of 12 for the her words they'd have told you that the latency of the human visual system is phi exceeded at this rates and everything everything about 60 hertz is moot yet Apple says you 120 hertz 2 the differences perceptible for many it turns out that Porifera factors like head movement haptic interaction with the screen and so forth and modify certain thresholds of visibility in the VR context is created because headaches and anybody who follows John comic strip to defeat little bitty continuously is
surprised that some of its subjects are very sensitive to visual artifacts that normal users don't notice so it's very easy to make fun about all your fires into 2 thousand on Ethernet cables
this is 1 of these and notice the small arrow or they are from this probably there because packets otherwise would get confused which way to go so these kinds of gadgets and there are many many examples of those of course so give ample ground to make fun of audio files but that's not what want what we want to hear today instead we want to look at master quality authenticated this new format as a development in the all you 5 world did deals with these aforementioned limits of perceptibility in a clever way exploits them to create and legitimize a new distribution channel for audio content any further will believe that these developments have possible repercussions outside of or if i want and might affect music consumers and producers and that is you um and enter labels and the layer of music is distributed improve always so again
and and you a stands for master quality authenticated with promises to use all the told this system QA website where this is some page on the web site join the Revolution recorded music but when there's a lot of a lot to unpack in this statement master and quality in authenticated to give you a little bit idea why I'm talking about this as I already said um I'm only but I also sometimes spend time on the other side of music namely music production
used to mention that the band or collision at a banquet present evil recalled the testosterone fresh and is a great record you just
shouldn't look at the way forms because it keeps all the way through luminosity a of 3 for those people who know what that means uh would be ministry and so for us it on the other side of things
I am also the interests in acoustic music this is me at time the studio and build in their among others to the boy depression depletion-mode and you to have recorded although I was and we
recorded this problem by Beatrix expect our which is piano and clarinet music and shallow music and the wonderful record so coming back to
and QA and you will understand that as an audio file and as somebody who the likes to be is to use a somewhat familiar with music production distribution and their marketing claims of studio hot solid and taken into the studio and so forth but of course raise an eyebrow with me and furthermore somebody tells me what promises that they want authenticate Additional file not only raise my eyeballs my profession curiosity is piqued but I have given talks see about the history of
authentication media and I publish on these issues on the questions of media of authentication so all things authenticating of interest to me in and QA promises of something like that so what they say it is it's all like what
the engineers fruit and data going to authenticate that when you playback device everybody with basic knowledge of intellectual property enforcement and divides management by now should be a little bit skeptical about the claims as we're going to show but this is rightly so but the devil's in the details and NQR offers an interesting and clever design of how to bring the true rights management back into music and the music distribution context as some of you may know other music with music industry has tried to do that several times and always to and implement Enceladus rights management to consumers into most disabuse channels the stave most suffice come with our dear and the so this again is the web said of and QA and you can see how they explain authentication and they have this interesting to provenance of and there is uh the point is here the blue and green light that light that will go on on your device and if an MQF high and displayed on this device an authenticated the promise solid like in the studio and began the so in order to understand and what they mean by quality in the acronym there it's important and to go back a little bit in history and if you background about additional you so what is quality
Our in the 19 eighties and did was introduced that means for the could call introduced to the consumer are here you see the future the city as advertised by Sonia thinkers at from 1984 and underlying format of the city's Redbook audio from where you have a signal that sampled at 16 bit um what of 44 K but some 44 thousand times a 2nd and to the 16 bit we have a dynamic range of 65 thousand values to Praat represent the difference between the most silent noticed signal pop signal in the formant and with 44 K we can represent the frequencies up to 22 kilohertz this is about 10 per cent higher than would you was was very good and that usually means very young users can hear most music today is recorded and distributed in this format the all the world standardized 44 1 k the video broadcasting uh would standardized 48 K and those of you who have strong systems and DVD parade base will be familiar with the 48 K sampling rate
so hard in the 19 nineties we need see another step we see a music production becoming fully digital the 2 all the workstations the 1st 20 24 bit converters arrive at the studios of we see higher sampling
rates so this is 1 of these converters from the from the nineties come into the 24 indicates that states can to 24 bits of and so
there was also an attempt to sell these higher of resolutions to the consumer in the late nineties with the little little bit different form at the the IN-CCD uh introduced by Sony in 99 is a different encoding scheme called G the our office 120 per 120 dB of dynamic range and in its initial of form went up to 50 100 so way above human ear hearing range but as many of you know this field in the market and is of course an interesting back story to this tool because of as a city was introduced in the very moment the patterns for the city expire and sunny try to push informative to market and have a new patent and licensing regime have to generate revenue so why did the SAC into supposedly higher quality fail not only because people couldn't really hear at
um on the turn of the 2 thousand we had MP3 in uh maybe 3 pretty much on all the market and Steve Jobs of put it best when he said convenience beats quality and and as you know we
turned around Apple basically on uh with the iPod which could hold this initial for and all 5 thousand so also something of and Steve Jobs knew what he was talking about but he was actually modified with the system worth north of 50 k installment supposedly only listen to vinyl but the this together was Napster basically killed the music market of in especially the market for high resolution audio Estes formats a call that exceed the Red Book standard audio files
to come back to all our story line here of course fault holy wars against P 3 in any form of lossy compression they deem deformitas inferior and it and argued that it destroys the generations hearing in even insights brain damage and and I was actually surprised at Douglas Rushkoff make this argument to M P 3 is bad for you of move on and he asks them down there will the next generation of music uh this music this must be able to hear reality the same way we did some of the ideas that for some of those the contact to reality you if you are exposed to lossy formats so but however body
fights to abandoned by some physical media and uh move things like these stand-alone digital audio converters font away in in the systems of streaming amplifiers and then either why you spew even at an you to stream music from local networks or from the internet into your system into these converters you can see here that offers Diasty which is as the is a city full model 16 24 bits and higher sampling rates allowed access to high resolution higher bitrate files it the so um the this is important because we come back to this in the context of an QA in of course you can ask about the the benefits of these kinds of devices and audibility of resolutions that higher than 16 bit and 44 1 k a of you the again I think of that might be individual selection here differences of current let's jump to the current decay time and
20 20 2010 so I'm I think a Cornish 45 because music in comes basically into the whole smallest at at very low prices of our streaming and furthermore that they can achieve
by lossless files in resolutions up to 24 bit and 192 keywords in online stores like this 1 this a French company could balls and you can see that of some of the contemporary current records are actually offered in these formants so you can buy the new of Bjork of record in high risk of you I ever X you haven't looked at what the resolution against 24 96 of something like that and was would even stream at that with the resolution of some over the internet and this is where the
website and we can compare the different offerings you just enter some band of some music in it will list you'll on the availability of these fires at different resolutions the so again in essence to 2010 some kind of a cool indicate 45 stick docs and streamers in their homes and could play the fires at the same resolution as recorded mixed and master in the studios but in their homes and this this context basically that the master quality authenticated form was launched and promoted intuitive uh 2014 there was a big launch event at
the chart at this high rise in London but looks a little bit like this tower in spends on resides so end of they claimed a revolutionary advances in audio and to deliver studio sold at home but not only that and that's where the story gets interesting and from the inventors uh credited as Peter Craven bookstore at you already smell stood on the picture on going where is that when it comes
back later date back to they came so the paper that was published in the Proceedings of the All-Union Society and they say that and builds on Advances in Neural Science and also sometimes say and advances in the sampling MIT beyond shot Shannon-Nyquist which a strong claims to make so if you go to and QA website you will
find this explanation the FAQ how does it work and it says and QA is based entirely on science specifically it's based on new findings in the assigned set of told us that the resolution of timing information is critical to all hearing in or what you bring into action so if you look in this the paper published in the s proceedings and look specifically at the nose science works cited there is I think it's 7 or something like that there is only 1 paper that actually deals with humans the other papers
test hearing with Mongolian Gavrilets and Bonn olds might
end up and it's probably another mistake to believe that these animals have very different of auditory system and we have end of the day hearing of exceeds our a hearing when it comes to high frequencies so building on these new scientific advances that they claimed to
correct for the time-domain arrows and additional audio chain namely errors introduced in analog converters so when you recorded now looks at signal in the studio and converted to digital but in the end um they say that these would create temporal blur this is what they he'll say there's a problem with the took digit with digital it's called blurring it's also from the website of you In this temporal blows them is basically the main marketing 112 and Cuba inequality argument the argument that it sells better uh rests to a large part on the scheme not only to bring this to sold to the whole but by reducing this what they call temporal blur the therefore marked the format so they claim contains mechanisms to cope and correct these temporal inefficiencies present all additional systems of an analog digital edition analog conversion takes place in removed the temporal blur in reviewers and audio
file press qualities innovations revolutionary in claimed that not only to be audible but to live music to a whole new level this is from the audio file yeah the public online publication the absolute sound they say let involution begin i'm and he had a bit more this compare books to work with Einstein if you read this year a this captures log cabin up there there's nothing new to be discovered in physics now all that remains a small more precise measurement Lord Kelvin 5 years before of Einstein's papers on relativity and
if you look Deacon depend attack some sorry for this you know you can read don't no but but they basically bring for the Thomas Kuhn the revolution of the structure of synthetic revolutions and talk about a paradigm shift in digital audio and even come up that the Copernican model so plentiful Timmy's both you and so forth so right so big things are happening all the right now you probably have inherited but we are entering a new paradigm and view currently in the fact that we sending here is actually indicate off the off to scientific crisis because we belong to the old world you think is probably not later so I this is of course the big debate happening all you felt world around claims like this and um much
of this debate is happening on the 2nd call computed audio file and to do this specifically the threat of which was opened to on January 2 this year and it has a mass to a 50 K views by now is really interesting because it is a couple of of really reputable be people publishing the on this on this forum and this fact of death death and many ultiple critics 1 of them is mastering engineer Brian you see who our has 6 Grammys and mastered among others to push modem Aramis and so forth and he basically said that the available and you our files that you can buy all stream by the tide service were not created in Marston studios the but encoded in an automatic way somewhere probably on the clock so the claim of and QA that you know you get the sound that that the artist and mastering engineers signed off on these different folds for them QA files available now and he must presume that it remains remains false because some there is no commercial power converters available that include QA encoding so nobody running a to do can actually use this format right now you have to send the files often including house where the gets encoded in signed so I the part of this controversies a couple
of people online who did deeper the research 1 of them is Akamai will blog or of an anonymous blogger who actually set up an into blind test and you are caught according Westerners hirers finds is she interested in that please look it up it's actually pretty complicated what he does because since the form the colors are not available that we cannot be properly in COLT music in QA in the past 4 years of the company has not a lot anybody to basically sent them fires in order to create the proper comparison between of and QA codifies and 5 stitches in PCM or any other format that you would have so I can model we invented it pretty interesting way to work around this limitation I can go further into that if you want to take this test and look at this website you another uh hacker that
had a look and this is a month for that who is of who's working on the socks so resampling uh package and some end and he has a gift let call side up I where you find the filter coefficients off and QA and and tools to actually look at 2 control bits and at street at that control stream of and QA than the and also this this later in the the moon this presentation to put it up so to wrap up my part so far in 2017
24 bit fires as credence to the weapons create a studio of able to order fires so the connection listen to what's happening in the to in the way of course there's other you know like the listening room and the uh the pivot change and so forth other permit affecting that and what they hear but doesn't actually matter and because most music as all of you will know all get's consumed in lossy formats by us modify or any other streaming service in in listened on because like this mono blue 2 speakers so in this context now and you project promises losses to do so and at home that is authenticated and they also some promise assault improvement by fixing the temporal blur supposedly happening in the AT and T a stage the so ontology who actually works on these matters will know investigators technical claims to the further the
thank of it in in the good the mind has just of introduced himself I do the same my background in Digital Audio suffered so changing slides itself is the way to press arrived and some of the current in the digital audio started in 1990 3 when I bought this CD player the on together with an amplifier and to anchor speakers and looking back at that time it was the only point in my life where actually carefully listen to audio quality as a listener uh I repeatedly listened to my favorite records which we have mostly dance music at that time again and again the player did so well and there's still makes the job today in later on in to the to Charles and I started studying at the 2 you a human all the close to let solution and I heard the lectures of the corresponding log who led to them in the nineties group that developed the M P 3 of the algorithm and with that Convention violator of Indian the Kate and elastic aid I became a very convenient and listener I downloaded to continuously and so of them in the current decade I I'm streaming sold nevertheless the all of course on q wants to sell system again to me and I'm inclined to say to do to 2 2 approaches to but not the 1 that comes with canned QA and so wide that is like that I'm going to show the novel so apart from the pure MRI in I do not appreciate your because what you credit quality of 1 of the and uranium and before we have a quick look at the audited technology uh let's take the following there's not much information out there from entry on the algorithm itself there are just mentioned already of maybe through the paper so convention papers of the AES there all patents which of course height the crucial parts and so increase their freedom to operate so it's so it's a vague but there's likely a lot of information from engineers that that looked at them into the details of and so do the reverse engineering so am curious and encoder-decoder system nested in a container such as free lossless audio coding all Apple audio coding whatever coding and I can all be in Microsoft and waste container them and today by can be wrapped around and decoded by audio and players in the Norton software of course and QA wants to replace the entire ordered chain they enter on a chain of AD converters and D A converters and so once to get royalties also from the streaming services and for the 2 main approaches to the the reduced to file size of such that you send a 24 hour and 20 to uh bandwidth of phi over and over the internet but nevertheless the unfolding is it you can still have two year hirers resolution audio the sodium Q. and K. claims our dairy lossless and which all improve the audio quality the and you're a scalable uh the more you pay the more blend with you get so from now on to something greater uh 48 curates you can unfolded 4 times and and on the prices are currently at 2 2 L and higher than for the original resolution all you did 24 bits and sampled at 192 kilohertz files important to know the end user does not own file and that this has been implications for example if you do a lot less the loudness of normalization on defined itself or room compensation you use the you lose D. and QA on license so to say and it's reduced to equality or below so 1 of those
claims in the AES paper which was written at the bottom is so we had to create a lossless compression lossless processing and hierarchical AP downsampling we highlight the quality and efficiency gains possible if the encoder and decoder on mutually and where and each matched to their analog converters so this is a bold claim and it's not based on evidence so we look into that so lossless compression in volume means Everest constant redundancy removal and the possibility to reconstruct the object of original recording bit by bit including the noise would have been in the noise belongs to the music or not lossy compression removes information be at audible or not
so it's anterior lossless Shannon's entropy stress allow us to assess the maximum redundancy in an audio file that can be removed without information loss so on a dataset of music is that from hot on a link is given to his paper on not but the paper itself is given in the bottom of this slide uh i'd did a entropy optimization and flak compression and reached for a certain high resolution data rate 50 per cent of time the file size so this is quite a lot of them term nevertheless the NQA however has a died data reduction of 57 per cent um the and so it it's it's obvious that this reduction knowing two bit depth and changing the amplitude and phase response is a lost of process and this is also highlighted in the paper that I give you guys defined or on so some of them like 16
exclaim and QA approach of recoding results superior in superior sound and significant lower data rate when compared to unstructured and coding and play that and has been enthusiastically supported listening trials with a number of recording and mastering engineers artists and producers so this is sort of a truly scientific wording that may give you an impression of the AS publications that so that we have this the resource uh and we analyze stretch of are you quickly take you through the sampling process on the left side you see a 2 columns and in the in the top you see a drawing of the sampling um scheme 15 minutes yes so we start with a band-limited analog time function and this is then multiplied in the time domain what was a serious of pulsars slow down in the structural and search and line we have year on multiplication and the right hand column shows you the frequency equivalent and the time Discrete signal gets quantifies with certain detects this bit depth so for high resolution resolution audio it's 24 bit per sample and then if you put an analog of low-pass filter on the on the signal you can reconstruct the original analog signal bit by bit and to 24 bit practically equal to the original signal would and changes for for example of the the the peace peace with spline kernel for responses scam sampling scheme and this fall improved the temporal resolution it's the highlight the of already mentioned that they highlight the detection of the human so the ability to detect regions with the tens of microseconds and so on because of all social matched to the song so the 2nd point is that they changed the do you know what the low-pass filter for avoiding pre ringing and for improving together with kernel the time resolution ecology blurring and compensation for the signal distortions from the analog digital conversion to during the recording process this so is it they're
actually improving sound quality of the temporal resolution all I should start with a listening test crystal already mentioned that there was no preference 2 words and QA compared to high resolution audio infection of in some situations standard high resolution all you was preferred so intent of temporal resolution is at improving uh alter the sound quality um if you look at of claims it shall allow for the detection of events that are as short as 10 microseconds which would be in the interests of 2 100 megahertz the quality blurring from and a 48 secured sampled signal this is questionable so I don't think that's actually the case of the next point it's a it's a to the song at 1st they call at the they they pose to on change the balance between time-frequency representation of the filters both are equivalent representations of the filter that is to use an adaptive filter we don't know actually watches what is tuned to the song so this information in in terms of 2 minimum-phase adjust to suppress free ringing on pre minimum-phase filters have their shortcomings they change the frequency response of the year the amplitude and phase response that has been also shown by Stefano model and in the last term of the last point 1 to make on the slide is 30 code ization there in the time domain to want the ringing of the common filters of the minimum phase that has and the ringing after the center of the filter and so to improve also temporal resolution and to compensate for the signal change that is also appointed as the final 2 looked at and so you clearly shows that that coordination so windowing and in fact this low-pass filter and not improving sound quality so what do
we need to and QA enhancement based on today's evidence from neuro science we're at so if we need a time resolution up in a table of 6 Mike microseconds um and it was so refer to the final hearing and in fact we are able to discriminate in time differences with just noticeable differences of 10 microseconds the the the those differences are however based on a central auditory comparison of some place to be between 2 years and because of the spatial Nyquist limit only defined structure of 2 frequency up to 1 . 3 kilohertz is analyzed and if we remember the in the bottle for example has of course that are closer together and that's why the can even detect them um differences that are small and and then in humans so and so from the media production said there's no need for an enhancement of audio from a scientific point as well as from an artistic point of view that is the concept with all variables composition performance practice etc. is captured on the multichannel files and the transmission chain has always been kept free from influences courted music is the message and so on finally interpreted by the interpreted by the auditory system so we don't need a channel that is the the preprocessing what's going on in our heads eventually the general question do
we need a HR audio resolution all you based on today's evidence from your science for listening to music and so I have here a year and a graph from 2 common fossil on psychoacoustics so the audible threshold in quiet so this this a solid line and it shows clearly we are not able to listen beyond that saved 20 kilohertz the moreover music has a amplitude spectrum with 1 over f so beyond ridiculous and some power it's very faint and that's from my point of view of a half the I can hardly imagine that we are able to listen um beyond 20 curate's nevertheless in the production on the production side we use filters which perform interpolation and for that case it's good to have higher elicit high-resolution audio and a point is the conservation of the of recordings of so if we store music digitally then of course it's good to have a lot of samples such that we can interpolate once there are errors arising so conclusion there's no
evidence-based research that supports audio quality claims of and QA and QA lossy because it reduces to the depths and the frequency response we see degradation of water quality of which in its current version might not always be audible the move and grave folding schemes only vaguely described and its disadvantages for high release high resolution you obviously disguised by marketing slogans like to blurring once and and QA infrastructure is established order quality can be easily scaled down into a description of kernel optimization for each track song alludes to a perceptual coding scheme which might eventually end up to a and B to equality on 1 thing to remember day of free I realized high resolution audio codecs that compressed audio losslessly white flag Internet and was not a big so in the western world anymore it increases and there's no need to go for lossy audio coding and most of the music as expressive already told us is suggestive still stored in CD quality if we up-sampled dose of those that information on signal to noise ratio decreases OK Changes in theft in correlate of so things on tone about it should good so the question is where's the deer and of basically out on already has shouldered the and employs a clever encoding scheme into a room as far as we know because this is proper Terry technology and we have to work with what we got and that is reverse engineering by some people online in some of the papers and other publications and eventually makes this again from the paper added unconscious mentioned for chiffon hotel where he and drew up from the MQ encoding scheme and important part of level is a pointer here but is at the PCM simple up there which you can see is 24 bits it as you can over the most see it's divided into 2 parts of basement is the only bits into subbands to date its so basically what in QA does this using a 24 bit sample of EU throwing away a itself that more or less a bits of that all you information and vary from other stuff basically in the noise floor at that a 24 bits sample but allows for Britain in a 2nd so I'm but if you look at the history I just gave you on additional all you this is the way back to square 1 because we had in 81 with the city Redbook standard 16 bits at 44 1 kilohertz what we know would get with and to a is in their own words right so something to the extent of 15 to 17 bits of dynamic of bandwidth and sampled at 48 kilohertz everything about 48 kilohertz of is encoded in a lossy compression scheme as just showed 2 sisters folding and what they talk about how this actually is accomplished detail we don't know it's uh supposing a guess of pretty clever way because you have to basically get spectral from 24 kilohertz with 96 converts into just a few bits and very that In the 6 7 8 bits that you get with MPI compression puzzle in anyway of you and QA a acknowledges that the Senate it's on infinite arrived at 16 bits 44 1 K is good enough for human hearing in all the information above 16 bit and above 44 48 converting in that term is Wallace useless not audible we can do something else with that so what do you do but they put their and it's a fairly complex and sophisticated cryptographic
scheme wait for that this 1 this is the blue light on the under the only on 1 of these into QA Dexter lights up when the finest authenticated and in
authentication to remind you of that it's an older term and it is rare on it promises to verify the origin of some of the data that so who is the Sender and integrity of the data under the conditions of all networks with data can be altered in any point in the transmission and Israelite requirements can only be met by a cryptographically means uh Mister content continuous reports on hacked cryptos indicate um MQI has to come up with a workable sufficiently secure systems as a tool to to make this possible into a partnered with the
German data security company with the mark or to create an authentication continent for the formant which America's major prevails cryptographic products and that established in the banking sector in Europe and also in the health care sector and assist website what to Michael so they offer lawful interception data retention services which is nice to have and they offer these hardware security modules which actually would and QA users some thing what you Mac also
published a white paper on QA it's available site it's very sparse and details but suggests didn't hear contains a public key infrastructure In that hot security modules like these ones shown
here and I will be deployed in at least
p and q way encoding houses input partly later on in the resting studios all to converters and as master so this would need to have this have a security modules in them or some sort of of artistic security Williams derived from from these devices it would America was use nice
way is it uh to provide a hardware security models for dummies book on this side which apparently order Jonas so far haven't been able to find of and he's hard physical the model security
models basically provide the means to embed the Mrs. necessary keys In the QA encoded files and the exact means of the scheme entrance schemes and the handling of the root of trust is unknown at this point in QA might outsource this to what you might call 1 might use descriptive service that uh do the key management OK I have to come to an end and but in the halls so the I like to
ask the audience here is this the and I don't hear anybody I guess this means yes yes OK so I'm asking this because NQA claims of course uh loop it's otherwise it's it's not the idea mn here's from us technical of MQS has no the replication of side of this to you we have no opinion on this beyond nothing noting that DM is a futile exercise but and this is like a large part of the narrative and online debate because and QA and and all the people involved including the all you press keeps to doing this is not the and because you can copy the files on it but copy protection is just 1 form of DM the goal of the error of is if you just look it up on Wikipedia for example this the 1st thing you see is to mess rights of use of data and this means both and restrictive and the promise the use cases so QA permits copying but it restricts hot air in access to parts of the fire namely the high resolution parts and soul India parlance this condition axis and x is only granted if you have an and QA comparable digital audio converter which you have paid for of course so I guess what was going to say is that in case something like a freemium model might you get the file that you can play on any kind of converters deeply how you components do you think she would be playable but if you want access to the premium part of that fire and you have to buy a device that was offered at a loss good to so why do they do that who appointment and then content and do the same error as it has been found than reverse engineer so far shows that they actually have provisions in place for copy protection I their provisions there are 2 of my encrypted defiance and with a sort of 25 minutes I find is also Britain's Press position schemes in there that why do they do this so Jimmy I just set temple music uh boss that the streaming services have a bad situation as no margins they don't make any money so he's talking about Titusville defense will force but where's our muscle cells prime prime episodes cell ipads and so forth so the problem is that you have to sell something else exclude outside of few streaming service in order to make money which of course at present place Amazon is currently the biggest
speaker of company in the world with these kinds of devices in is catching up so our interpretation of was MPI is trying to do is it's trying to generate a new licensing stream but for the music industry was specifically for and 8 uh and these elements of the music production distribution consumption value chain would need in QA licenses the recording software and plug-ins the recording mussing streams with the new converters the artists that would get them back catalogs were remastered and would have to agree on that string services would have to sign up with them uh physical medium effectors if it comes to that of course all the high manufacturers of and and customers also on going on at the paying into our OK skip all this
um wiser a clever ways a stealth I think the encoding schemes that MQI employs make very clever use of the space afforded by 24 bit samples uh namely i to stealthily introduce a DM Indian music uh um production distribution and consumption the value chain in the don't all we talk about an image is actually very very difficult to find these elements into if you ask me what to do to what's in this context of conference here it would be worthwhile if people start to dig deeper work on what and q is actually doing well they just appear thank you thank you thank you very much for the talk we have knowledge 5 minutes for questioning and answering so please line up to the microphones and do you have a question from the Internet new the time and yeah so microphone number 1 and all of that you talk and you talked about the reverse engineering of members all this kind of sounds that they wouldn't have these complicated hoppers introdu modules the best well and if it's the specific firmware where in 1 product it has to reverse engineer from sold and I don't know the security provisions of that uh this is hardly security modules won't be at this point part of the consumer products they will be part of the converters in the encoding holes into the the distribution the context of EU how the exact crypto to works of between the and QA files and uh the consumer docks and is not yet known this is this some hints indications will find this in this resources of how that works um but half a security models will be employed in the in the production distribution a part of the the that of the sky cookies of another question from workable phone number of form and again thank you for a talk I'm I have 2 questions 1 of them is of the you think that the marketing concept will have any success at all and the 2nd 1 is what do you think that some music encoding does the walls anywhere else the and multichannel including instead of uh increasing from the sample rate and some of its and can thank you good questions and i think o this from this is a good example of how not to market something because I can't think of any product it has managed to create more down with both the consumers off of this product and also often manufacturers and all kinds of other people to involve additional what you mean and QA I think they went out some of of the variables claims try to play the audio files with their you the easy such as stability of the surprised by the competence in the audience so why don't think this will go anywhere in students was a 2nd question of all tell the encoding of using involves this really going from what some of like the 5 channels 8 channels maybe 16 channels at some point a lot to some people still try to increase the bitrate and of frequency so I strongly question fondle them and then can we as an audio file into this in order from market multitude of it's serial might mean for the consumers this is why should is due to speaker everybody's happy with model and all of you and it doesn't seem to be a problem of roots certifies will have a lot of fun to have stereo set ups and and what it shows that helps create problems with rooms and conventional kinds of things that you it might be different in the in the sector of shoe in more general terms I think all users solve problem really 24 bits and 190 to should should be enough default in always correction and and phase correction in with speakers so that's where the real problems within section we profits additional some and we call violation a lot of big crossovers yes across all of these kind of things think you can add parametric is used in multichannel audio so you sent 1 mono signal and then you can reproduce by parliament as a room for from multichannel said yeah that's often used since I think we have time for another question Inc yeah but it was a question from what someone where went to 3 conferences and it's all here and using this year it in this area here and I think a story about the order of 10 to the 10th is the instigation of God an or it's it's fabulous and I wanna they do they make any claims do like virtual analog models of the original converters on how do they have this story is complete is like phrasing that it actually is being mentioned in the Qur'an marketing model that if the quality fingerprint the or the original analog digital converter and compensate for definitive for the deficiencies in arrows this converter makes index 1 of the big claims is that is a device-specific compensation embedded in the QA fire of being called upon replay and enhance the better quality of experience for the listener but all the evidence so far shows that this is absolutely not true what we have is a pistol and coding just like you would have an M P 3 or something else the encoding apparently analyzes the file to solve all the track of a mix of provisions on hold true fold the signal so how many bits get allocated to in the dynamic range of the the Patrick races so there's no authentication or fingerprinting or any kind of modelling the analog part of the the the part in the chain thank you very much for questioning and things wouldn't very much for the talk which was to what is
if you this is the of and to keep the to
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Metadaten

Formale Metadaten

Titel MQA - A clever stealth DRM-Trojan
Untertitel A critical look on a new audio Format
Serientitel 34th Chaos Communication Congress
Autor Engemann, Christoph
Anton.schlesinger@studio-singer.de
Lizenz CC-Namensnennung 4.0 International:
Sie dürfen das Werk bzw. den Inhalt zu jedem legalen Zweck nutzen, verändern und in unveränderter oder veränderter Form vervielfältigen, verbreiten und öffentlich zugänglich machen, sofern Sie den Namen des Autors/Rechteinhabers in der von ihm festgelegten Weise nennen.
DOI 10.5446/34871
Herausgeber Chaos Computer Club e.V.
Erscheinungsjahr 2017
Sprache Englisch

Inhaltliche Metadaten

Fachgebiet Informatik
Abstract Master Quality Authenticated (MQA) is a new audio format promising studio sound at home and no DRM. We take a critical look both at the sound-quality aspects as well as on the DRM story of MQA.
Schlagwörter Security

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