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Thanks :) As it happens I'm aware you can drive the T220/221 with one DVI channel - but then you can't actually use the full resolution of the panel. Since pretty much the only reason to buy it is the high resolution this would be... how shall I put it... marginally sub-optimal ;)

As the a/c has mentioned, 1920x1200 out of a single DVI channel requires a reduced blanking interval. Should be OK since you're using an LCD which doesn't need the flyback time, but as I understand it, it's officially still out-of-spec. So, it's possible that it won't be supported by the graphics card and/or another display device - in other words, whilst you may be able to, you can't guarantee you will be able to get 1920x1200 out of a single channel, which was my (somewhat incautiously worded) original point. The DVI v1.0 specifies 5% blanking interval, so that's what's guaranteed to work, anything else, well YMMV...

One of the biggest reasons that many companies want a standard outside of DVI and HDMI is the fact that Silicon Image and Intel basically control the show when it comes to digital interfaces. Intel needs to be mentioned because, although Silicon Image appears to spearhead the standards and controls key patents (e.g. TMDS), Intel exerts a high level of influence due to partial ownership of Silicon Image and DCP LLC. In fact, if you look at DCP LLC's address at the bottom of its web page, it resides inside Intel!

When DVI first came out, it was in a camp that was separate from VESA, the independent standards body responsible for the video signalling standards for PCs. VESA had been looking for a digital alternative for years but the Digital Display Working Group promoted DVI through some of the bigger manufacturers of both computer displays and manufacturers of electronics of those displays. DVI was ok but it was plagued with problems like a poor quality connector, limited cable length and very poor standards compliance. This largely limited DVI's adoption in the market for a number of years. The copy protection standard, HDCP, was added in the usual fashion of trying to "protect" the content providers. As for the standards compliance, Silicon Image knew it had screwed up and so created a compliance test center. The irony here is that Silicon Image's own first generation receivers don't even work with some of its own transmitters!

Though most consumer electronics manufacturers were included in the DDWG, at least one was conspicuously absent during the formation of HDMI, which is backwards compatible with DVI but has a smaller and more robust connector and more geared for consumer electronics rather than PC applications. That absent company was Samsung, and Ian Miller of Samsung was quite important in the VESA organization. VESA had continued during the time of HDMI's creation and ramp-up of making a new standard, the latest one being NAVI that died on the vine. Having been excluded, and knowing Samsung's growing presence in many markets and the stranglehold of Silicon Image and Intel with respect to patents and copyright protection control with limp alternatives, I believe that the current companies within DisplayPort led by Ian Miller decided to take the initiative and move forward with an independent DisplayPort standard and independent copy protection mechanism. The new copy protection scheme, called DPCP, is administered by Philips rather than Intel.

The physical layer of DisplayPort is largely based on PCI Express in order to leverage the intellectual property already within these companies and avoid licensing and royalties associated with Silicon Image's TMDS and Intel's HDCP. One very interesting point for all /.ers - the interface standard is optionally encrypted with DPCP, but it can apply to every single link both outside and inside the display! This means that you may not be able to crack your panel open and hack the hardware inside without a hacked encryption key (which is heavily guarded at all points within its acquisition and programming into devices). Even with HDCP, it would be a simple matter in a flat panel to take the unencrypted LVDS output and fabricate a small board with an unencrypted DVI digital output for HDTV. Therefore, don't look at DisplayPort as anyone's savior. It also remains to be seen if people will accept yet another display connector for their PCs and the resultant fragmentation, though both ATI and Nvidia are on board DisplayPort.

In short, don't expect a whole lot of advantages for the end user here. The politics of the display industry are significant and the average consumer will continue to suffer as these politics play out in the grander scheme of business.

The 30" monitors from Apple have a resolution that cannot be fed by a single-link DVI connection. So they use dual-link DVI. Both single-link and dual-link are part of the DVI 1.0 standard, nothing Apple specific about them.

The difference between single-link and dual-link is how many of the pins in the connector is used for transmitting data, in a nut shell 12 pins for the former and 24 pins for the later.

Apple is using DVI-D (digital only) DVI connectors with a dual-link pin out for the 30" display. So one dual-link DVI-D connection is capable of driving one 30" display. The 6800 adapter used for these displays provides two dual-link DVI-D outputs, so one adapter can drive two 30" displays.

As a reference...

DVI connector type summary
DVI 1.0 specification (PDF)

Errr, isn't Dual Link DVI only one port? It just uses all the pins in the connector. http://www.ddwg.org/dvi.html

The 6800 for the Mac actually has 2 Dual Link DVI ports, or "Dual Dual Link DVI."

DVI Spec

DVI dual-link goes up to about 350 MPix/sec bandwidth, according to the people who developed it. At 75Hz with normal blanking intervals, that still works out to 2048x1536, according to them, and significantly higher with an LCD at 60 Hz and 5% blanking. Apple gets 2560x1600, which seems to be a bit higher than 1920x1080. With 60 Hz 5% blanking, you can just do 1920x1080 on a single-link connector, although with higher refresh rates and normal blanking intervals, you have to go dual-link.

The 30-inch needs DVI Dual-Link (DDL), instead of Single-Link. The docs and presentations are really directed towards people who would be buying a mac to use this with. The 'Apple Display Technology' PDF that's linked on their website about the new displays says you can use the 30-inch on a WIndows PC if the card there handles DVI Dual-Link.

The dual-port DVI card lets you connect two 30-inch displays to one machine. The 30-inch display doesn't use both DVI ports on the card.

Fool! DVI is an encrypted data stream!

See this PDF for more information:


http://www.ddwg.org/if/data/0830991.pdf

-molo

For the past year I've been using a Matrox G200 MMS Quad card. (yeah, it's PCI and only 8mb * 4, but all I do is code.) At the moment I've got four matched IBM digital flat panels hooked up. (note, this doesn't inspire too many kind words from my coworkers!) I like it, however, #1 doesn't get much use. In Win2k, I have the taskbar in #3, and so my vision is centered, with #2 and #4 peripheral. I'm actually seriously considering removing the #1 panel!

What I'd really like to see from Matrox, and the industry, is some improving on the 1280*1024 @ 85hz limit for DVI spec. AFAIK you can't get digital output from a card to a flat panel monitor at higher than this resolution. (IBM's top end flat panel uses all four channels of a modified G200 to get digital to it's 2560*2048 model.)

If Matrox's new card will support a high res digital panels on an agp interface, I'll be first in line to pick one up.

Then, you could keep the noisy disks in a utility room where they belong and the desktop would be a handful of small quiet cubes

There are some products out there which let you extend DVI using fiber optics (100 yards) or electronic repeaters (50 yards). Take a look at www.gefen.com. You could put your PC off in the closet and have just a perfectly silent monitor+keyboard in your office.

The fiber equipment is ridiculously expensive - about $3K, but the electrical repeaters are probably a bit more affordable.

You can't do this with VGA due to the distortion and ghosting, but it works flawlessly with DVI. Also the spec on DVI is an interesting read - it was actually designed with optical transmission in mind. The data rates are insane, so it's split across four channels (clock + 3 colors, IIRC) - the total data rate for a 1600x1024 display is something like 4Gbps.

I know they're using TMDS to keep things robust, but does anyone know what the maximum data rate is on that cable?

I believe there are 6 data channels in the cable, according to Apple:

http://developer.apple.com/techpubs/hardware/Devel oper_Notes/Macintosh_CPUs-G4/PowerMacG4Cube/trin-5 7.html M

and then there's the DVI spec itself (of which ADC is a superset, I believe):

http://www.ddwg.org/register/download.html

but I can't decipher enough of the raw standard to figure out if/what the max. resolution is given current technology.

The link the article was a link into the Apple store that timed out. http://www.apple.com/displays/acd22/ ; ; ; is a more permanent link to information. (square pixels, top notch image quality)

The input is TMDS from the Digital Display Working Group. Follow the link, hit product list, search for vendor and cards. (Be aware the the connector changed recently. New Cinema Displays have a combined power/video/usb connector, you may need a fancy cable to get into it from your video card.)

I have used a number of flat panel displays from different vendors. I must say the Apple ones are the best I've used, no exceptions. Its especially striking when an Apple display is next to another brand.

If you decide to buy one you should go by smalldog. You won't find a better reseller and they sell off refurbished Apple units at reduced cost. All my displays are refurbs, I've never had a problem.

Prepare to witness the most concerted and massive engineering effort -- both social and technical -- ever undertaken by mankind: The digital equivalent of damming the ocean.

I wrote about this on Slashdot almost a year ago, in the vague hope it might become a featured article: The music and movie industies are working very hard to prevent you from using your lawfully-obtained material in any way they don't want. To that end, they have formed the Copy Protection Technical Working Group (CPTWG), which is working hand-in-hand with a ton of high-tech companies to bring pervasive copy protection measures to your PC.

I saved my original screed on the subject, and it's reproduced below, with appropriate updates. Bottom Line: Do not let them sneak this garbage past you or your friends. If you find that a product contains copy protection, don't buy it, and encourage others to do likewise.

____________________

Recent stories on Slashdot have told of the ongoing "tennis match" between digital content providers versus consumers and technically skilled people. The recent cracking of DVD's Content Scrambling System (CSS) lent ammunition to the opinion held by computing professionals and users that copy protection systems are doomed to fail. The effort has been likened to building a dam against the ocean; a foolish and useless exercise. In Slashdot discussion fora, the point has often been raised, "If you can perceive it, you can copy it. What are they going to do, encrypt the bits all the way to the speaker/electron gun?" If the Copy Protection Technical Working Group gets its way, that is precisely what's going to happen.

I received a piece of email spam today, which actually turned out to be useful (probably the only time that's ever happened anywhere). It directed me to a flat panel display industry group. Among others, one of the links pointed to the California Display Network, which had a link pointing to technical info on flat panel technology. Since I currently earn my living writing graphics card and display drivers, I clicked through to see what I could learn.

I found an entry for an overview of digital visual interfaces, provided by Silicon Image. As I reviewed the headings of the slides, one entry stopped me cold: Conten t Protection Status. Content protection? In a flat panel?? Yup: "Implementation of DVI content protection is suitable for PCs and monitors." [emphasis mine]

Thus began an evening of link clicking and Google searches to find out what this off-handed remark could mean. The slide made mention of the 'CPTWG'. This is the Copy Protection Technical Working Group, a consortium of content providers (movie companies), consumer electronics manufacturers, and players in the IT industry. This is the same group that developed CSS for DVD players.

One paragraph from the above page is particularly disturbing:

CPTWG has focused until now only on "casual piracy [sic]", characterized as what a grandmother can do in her home with her DVD. Piracy [sic] requiring even the level of expertise (and equipment) of her grandson, who might be an EE student, has been excluded from consideration. There is a growing awareness that a broader content protection effort may be necessary.

The most recent meeting of the CPTWG was yesterday, 8 December, 1999. Their meeting announcements may be found here. It costs $100 to attend. According to the site, their last meeting was on 11 April 2000. It's not clear if additional meetings have been held at regular intervals.

The attendance roster from the April meeting (RTF file) lists a very interesting, and possibly worrying, mix of organizations. A partial list of representatives included:

• MPAA (Motion Picture Association of America),
• AFMA (American Film Marketing Association),
• Sony Pictures Entertainment,
• Universal Studios,
• Warner Bros.,
• Disney,
• Paramount,
• CEMA (Consumer Electronics Manufacturers Association),
• MEI (parent company to Panasonic), makers of consumer electronics,
• Pioneer, makers of consumer electronics,
• JVC, makers of consumer electronics,
• Philips, makers of consumer electronics and VLSI components (including video encoders),
• Sony, makers of consumer electronics, computers, and displays,
• Toshiba, makers of consumer electronics, computers, flat panels, disk drives, digital cameras, copiers, and laser printers,
• NEC, makers of computers, displays, printers, and telecomm equipment,
• Hewlett Packard, makers of computers, printers, and testing/measuring equipment (oscilloscopes, logic analyzers, etc.),
• Quantum, makers of disk drives,
• IBM, makers of computers, disk drives, and bunches of other stuff,
• Compaq, makers of computers,
• Apple Computer, makers of computers,
• ATI Technologies, makers of PC graphics cards,
• Dolby Labs, creators and licensors of audio enhancement technologies,
• Intel, makers of microprocessors, motherboard controllers, and graphics and peripheral chips,
• Microsoft, software market monopolists,
• Dow Chemical (I have no idea why they're here),
• DVD-CCA, licensors of CSS, and currently in court trying to prevent the spread of DeCSS,
• A number of law firms.

If you download the roster and read closely, you'll see every major piece of your computer represented. There is no doubt that at least one part of your computer -- your CPU, your RAM, your disk drive, your graphics card, your monitor -- is manufactured by one of these companies.

If you look further still, you'll see there are no consumer advocacy groups listed.

What are they all working toward? Quite simply, to prevent you from using your lawfully obtained digital material in any way they don't want.

Here's one example of how they'll do it: If you've visited Fry's or CompUSA recently, you'll notice that full-size flat panel displays are starting to appear. Currently, most of these displays are based on the old VGA analog signals, which are converted into the digital signals needed by the panels. The Digital Display Working Group is working on a new connector and signalling standard called Digital Visual Interface (DVI) that will allow computer displays to go all-digital. You won't need a DAC on the video card; the digital signals will be fed straight through to the display. Image fidelity will be much higher, since there won't be any intervening DAC/ADC conversions. Version 1.0 of the standard has been published and is available for download (PDF format). The DVI spec currently does not stipulate copy protection measures. However, plans are in the works to incorporate it.

Intel is one of the primary contributors to this effort. On Intel's developer site, they have some papers on copy protection for IEEE 1394 (Firewire) digital streams. In two separate articles, 1394-based Digital Content Protection: an Intel Proposal, and Content Protection for IEEE 1394 Serial Buses (the latter being a Powerpoint presentation masquerading as a PDF file), Intel outlines its proposal for protecting digital content over Firewire. By using cryptographic authentication techniques, a device offering digital content will "handshake" with other devices on the bus to assure that digital data is only received by, "compliant devices." In a revised overview of the proposal, IDF Talk: Content Protection for the IEEE 1394 Bus, Intel offers concrete implementation details, including:

• DSS (Digital Signature Standard)
• Diffie-Hellman key exchange for device authentication,
• Blowfish cipher for content encryption, with a keylength of 32-128 bits,
• Digital watermarking techniques to declare "rights" (right to playback, right to copy, etc.) to the receiving device.

The full proposal (currently version 0.91), with lots of technical detail, is mirrored on CPTWG's site (the links to Intel's site don't work).

Intel's proposal also recommends that the copy protection system be field-upgradeable to thwart ongoing attacks, and that it should be possible to revoke (read: disable) a device determined to be "compromised." (The tone of the proposals is also interesting. It's previously been thought that, because of USB, Intel is hostile to IEEE 1394. Yet these proposals suggest that Intel's quite enthusiastic about 1394... Once copy protection is incorporated.)

Intel's proposal mentions only IEEE 1394. However, it also mentions that there's nothing preventing the technique being applied generally to any bi-directional link. So for all occurrences of '1394', substitute 'DVI', and you've got an idea of what to look forward to in your new digital monitor. And your new DVD player. And your new HDTV set. And your new USB speakers.

Intel goes even further in their paper, A Framework for DVD-Audio Content Protection. In it, the author suggests that DVD-Audio recorders permanently remember the IRSC (International Standard Recording Code) of every song the device is asked to copy, so that it may only be copied once, period. They go on to suggest that the recorder could have a modem built-in to authorize (read: purchase) the ability to make additional copies.

In short, through this industry consortium, Hollywood proposes to exert control over every link in the digital chain, from the digital camera, to the disk drive, to the CPU, to the graphics card, to your display. They will decide what rights you have. Even if a court decides Fair Use includes multiple copies for personal use (such as assembling a video montage), it won't matter. Your computer will still refuse to make the copies (and probably fink on you, as well).

This coordinated effort is ostensibly to combat unsanctioned copying (which the industry chronically refers to incorrectly as 'theft' and 'piracy'). However, no one has ever been able to provably quantify the value of unrealized sales due to such copying. All dollar estimates that have been published are just that: estimates, based on idealized extrapolations of what-if scenarios. Moreover, although the industry claims to "lose" billions every year, they continue to post record profits. Finally, despite the proliferation of CDR drives and the Internet, most unrealized sales are the result of organized mass counterfeiting rings, not casual copying. None of the proposed methods I've seen appear to thwart mass counterfeiting at all. So clearly there's some other reason for all this.

The thing that puzzles me most is why the computer and consumer electronics industries haven't told Hollywood to take a hike. Intel's copy protection proposals state, in bold letters, "No content protection = No Hollywood content." This belief is taken as axiomatic by all the players, and appears to be the driving force behind the entire effort. This belief is also false.

Audio on CDs are recorded as plaintext, and the music industry continues to earn rapacious profits. Even the with the advent of CDRs, no music industry executive in his right mind would suggest dropping CD sales and going strictly with cassettes and vinyl. If nothing else, the manufacturing costs for CDs are lower than those for cassettes and vinyl. Likewise, DVDs are tremendously cheaper to produce than videotapes. Videotape duplication is a labor-intensive process; DVDs can be stamped out automatically. The savings in cost-of-goods alone would more than balance against any unrealized sales from casual copying. Corporate shareholders, always mindful of the bottom line, will also demand that the studios move to the cheaper, higher-quality process, copy protected or not.

The fact is that the computer and electronics firms are in the driver's seat, and are free to dictate how the new digital formats will work. Hollywood will use whatever format becomes popular, whether it has copy protection or not. They may grumble about it, but they'll use it. The economics afford them little choice.

We are only now beginning to explore the social and ethical consequences of a Star Trek-like universe where everything can be infinitely duplcated at zero cost. We have no idea where things will end up. But now is not the time to start erecting electronic walls and imposing artificial scarcity. The ignoble and richly-deserved death of DIVX showed -- fairly unequivocally, I thought -- that consumers want to make free, fair use of their digital media, without interference from outside. I believe its death reinforces the future toward which we've been pushing for centuries: Increased abundance at reduced cost. We can only hope that the lesson of DIVX will be repeated until it is learned.

Schwab

Prepare to witness the most concerted and massive engineering effort -- both social and technical -- ever undertaken by mankind: The digital equivalent of damming the ocean.

I wrote about this on Slashdot almost a year ago, in the vague hope it might become a featured article: The music and movie industies are working very hard to prevent you from using your lawfully-obtained material in any way they don't want. To that end, they have formed the Copy Protection Technical Working Group (CPTWG), which is working hand-in-hand with a ton of high-tech companies to bring pervasive copy protection measures to your PC.

I saved my original screed on the subject, and it's reproduced below, with appropriate updates. Bottom Line: Do not let them sneak this garbage past you or your friends. If you find that a product contains copy protection, don't buy it, and encourage others to do likewise.

____________________

Recent stories on Slashdot have told of the ongoing "tennis match" between digital content providers versus consumers and technically skilled people. The recent cracking of DVD's Content Scrambling System (CSS) lent ammunition to the opinion held by computing professionals and users that copy protection systems are doomed to fail. The effort has been likened to building a dam against the ocean; a foolish and useless exercise. In Slashdot discussion fora, the point has often been raised, "If you can perceive it, you can copy it. What are they going to do, encrypt the bits all the way to the speaker/electron gun?" If the Copy Protection Technical Working Group gets its way, that is precisely what's going to happen.

I received a piece of email spam today, which actually turned out to be useful (probably the only time that's ever happened anywhere). It directed me to a flat panel display industry group. Among others, one of the links pointed to the California Display Network, which had a link pointing to technical info on flat panel technology. Since I currently earn my living writing graphics card and display drivers, I clicked through to see what I could learn.

I found an entry for an overview of digital visual interfaces, provided by Silicon Image. As I reviewed the headings of the slides, one entry stopped me cold: Conten t Protection Status. Content protection? In a flat panel?? Yup: "Implementation of DVI content protection is suitable for PCs and monitors." [emphasis mine]

Thus began an evening of link clicking and Google searches to find out what this off-handed remark could mean. The slide made mention of the 'CPTWG'. This is the Copy Protection Technical Working Group, a consortium of content providers (movie companies), consumer electronics manufacturers, and players in the IT industry. This is the same group that developed CSS for DVD players.

One paragraph from the above page is particularly disturbing:

CPTWG has focused until now only on "casual piracy [sic]", characterized as what a grandmother can do in her home with her DVD. Piracy [sic] requiring even the level of expertise (and equipment) of her grandson, who might be an EE student, has been excluded from consideration. There is a growing awareness that a broader content protection effort may be necessary.

The most recent meeting of the CPTWG was yesterday, 8 December, 1999. Their meeting announcements may be found here. It costs $100 to attend. According to the site, their last meeting was on 11 April 2000. It's not clear if additional meetings have been held at regular intervals.

The attendance roster from the April meeting (RTF file) lists a very interesting, and possibly worrying, mix of organizations. A partial list of representatives included:

• MPAA (Motion Picture Association of America),
• AFMA (American Film Marketing Association),
• Sony Pictures Entertainment,
• Universal Studios,
• Warner Bros.,
• Disney,
• Paramount,
• CEMA (Consumer Electronics Manufacturers Association),
• MEI (parent company to Panasonic), makers of consumer electronics,
• Pioneer, makers of consumer electronics,
• JVC, makers of consumer electronics,
• Philips, makers of consumer electronics and VLSI components (including video encoders),
• Sony, makers of consumer electronics, computers, and displays,
• Toshiba, makers of consumer electronics, computers, flat panels, disk drives, digital cameras, copiers, and laser printers,
• NEC, makers of computers, displays, printers, and telecomm equipment,
• Hewlett Packard, makers of computers, printers, and testing/measuring equipment (oscilloscopes, logic analyzers, etc.),
• Quantum, makers of disk drives,
• IBM, makers of computers, disk drives, and bunches of other stuff,
• Compaq, makers of computers,
• Apple Computer, makers of computers,
• ATI Technologies, makers of PC graphics cards,
• Dolby Labs, creators and licensors of audio enhancement technologies,
• Intel, makers of microprocessors, motherboard controllers, and graphics and peripheral chips,
• Microsoft, software market monopolists,
• Dow Chemical (I have no idea why they're here),
• DVD-CCA, licensors of CSS, and currently in court trying to prevent the spread of DeCSS,
• A number of law firms.

If you download the roster and read closely, you'll see every major piece of your computer represented. There is no doubt that at least one part of your computer -- your CPU, your RAM, your disk drive, your graphics card, your monitor -- is manufactured by one of these companies.

If you look further still, you'll see there are no consumer advocacy groups listed.

What are they all working toward? Quite simply, to prevent you from using your lawfully obtained digital material in any way they don't want.

Here's one example of how they'll do it: If you've visited Fry's or CompUSA recently, you'll notice that full-size flat panel displays are starting to appear. Currently, most of these displays are based on the old VGA analog signals, which are converted into the digital signals needed by the panels. The Digital Display Working Group is working on a new connector and signalling standard called Digital Visual Interface (DVI) that will allow computer displays to go all-digital. You won't need a DAC on the video card; the digital signals will be fed straight through to the display. Image fidelity will be much higher, since there won't be any intervening DAC/ADC conversions. Version 1.0 of the standard has been published and is available for download (PDF format). The DVI spec currently does not stipulate copy protection measures. However, plans are in the works to incorporate it.

Intel is one of the primary contributors to this effort. On Intel's developer site, they have some papers on copy protection for IEEE 1394 (Firewire) digital streams. In two separate articles, 1394-based Digital Content Protection: an Intel Proposal, and Content Protection for IEEE 1394 Serial Buses (the latter being a Powerpoint presentation masquerading as a PDF file), Intel outlines its proposal for protecting digital content over Firewire. By using cryptographic authentication techniques, a device offering digital content will "handshake" with other devices on the bus to assure that digital data is only received by, "compliant devices." In a revised overview of the proposal, IDF Talk: Content Protection for the IEEE 1394 Bus, Intel offers concrete implementation details, including:

• DSS (Digital Signature Standard)
• Diffie-Hellman key exchange for device authentication,
• Blowfish cipher for content encryption, with a keylength of 32-128 bits,
• Digital watermarking techniques to declare "rights" (right to playback, right to copy, etc.) to the receiving device.

The full proposal (currently version 0.91), with lots of technical detail, is mirrored on CPTWG's site (the links to Intel's site don't work).

Intel's proposal also recommends that the copy protection system be field-upgradeable to thwart ongoing attacks, and that it should be possible to revoke (read: disable) a device determined to be "compromised." (The tone of the proposals is also interesting. It's previously been thought that, because of USB, Intel is hostile to IEEE 1394. Yet these proposals suggest that Intel's quite enthusiastic about 1394... Once copy protection is incorporated.)

Intel's proposal mentions only IEEE 1394. However, it also mentions that there's nothing preventing the technique being applied generally to any bi-directional link. So for all occurrences of '1394', substitute 'DVI', and you've got an idea of what to look forward to in your new digital monitor. And your new DVD player. And your new HDTV set. And your new USB speakers.

Intel goes even further in their paper, A Framework for DVD-Audio Content Protection. In it, the author suggests that DVD-Audio recorders permanently remember the IRSC (International Standard Recording Code) of every song the device is asked to copy, so that it may only be copied once, period. They go on to suggest that the recorder could have a modem built-in to authorize (read: purchase) the ability to make additional copies.

In short, through this industry consortium, Hollywood proposes to exert control over every link in the digital chain, from the digital camera, to the disk drive, to the CPU, to the graphics card, to your display. They will decide what rights you have. Even if a court decides Fair Use includes multiple copies for personal use (such as assembling a video montage), it won't matter. Your computer will still refuse to make the copies (and probably fink on you, as well).

This coordinated effort is ostensibly to combat unsanctioned copying (which the industry chronically refers to incorrectly as 'theft' and 'piracy'). However, no one has ever been able to provably quantify the value of unrealized sales due to such copying. All dollar estimates that have been published are just that: estimates, based on idealized extrapolations of what-if scenarios. Moreover, although the industry claims to "lose" billions every year, they continue to post record profits. Finally, despite the proliferation of CDR drives and the Internet, most unrealized sales are the result of organized mass counterfeiting rings, not casual copying. None of the proposed methods I've seen appear to thwart mass counterfeiting at all. So clearly there's some other reason for all this.

The thing that puzzles me most is why the computer and consumer electronics industries haven't told Hollywood to take a hike. Intel's copy protection proposals state, in bold letters, "No content protection = No Hollywood content." This belief is taken as axiomatic by all the players, and appears to be the driving force behind the entire effort. This belief is also false.

Audio on CDs are recorded as plaintext, and the music industry continues to earn rapacious profits. Even the with the advent of CDRs, no music industry executive in his right mind would suggest dropping CD sales and going strictly with cassettes and vinyl. If nothing else, the manufacturing costs for CDs are lower than those for cassettes and vinyl. Likewise, DVDs are tremendously cheaper to produce than videotapes. Videotape duplication is a labor-intensive process; DVDs can be stamped out automatically. The savings in cost-of-goods alone would more than balance against any unrealized sales from casual copying. Corporate shareholders, always mindful of the bottom line, will also demand that the studios move to the cheaper, higher-quality process, copy protected or not.

The fact is that the computer and electronics firms are in the driver's seat, and are free to dictate how the new digital formats will work. Hollywood will use whatever format becomes popular, whether it has copy protection or not. They may grumble about it, but they'll use it. The economics afford them little choice.

We are only now beginning to explore the social and ethical consequences of a Star Trek-like universe where everything can be infinitely duplcated at zero cost. We have no idea where things will end up. But now is not the time to start erecting electronic walls and imposing artificial scarcity. The ignoble and richly-deserved death of DIVX showed -- fairly unequivocally, I thought -- that consumers want to make free, fair use of their digital media, without interference from outside. I believe its death reinforces the future toward which we've been pushing for centuries: Increased abundance at reduced cost. We can only hope that the lesson of DIVX will be repeated until it is learned.

Schwab

I submitted this to Slashdot's Your Rights Online section some weeks ago, but it was rejected. I think the article is pertinent here.

Recent stories on Slashdot have told of the ongoing "tennis match" between digital content providers versus consumers and technically skilled people. The recent cracking of DVD's Content Scrambling System (CSS) lent ammunition to the opinion held by computing professionals and users that copy protection systems are doomed to fail. The effort has been likened to building a dam against the ocean; a foolish and useless exercise. In Slashdot discussion fora, the point has often been raised, "If you can perceive it, you can copy it. What are they going to do, encrypt the bits all the way to the speaker/electron gun?" If the Copy Protection Technical Working Group gets its way, that is precisely what's going to happen.

I received a piece of email spam today, which actually turned out to be useful (probably the only time that's ever happened anywhere). It directed me to a flat panel display industry group. Among others, one of the links pointed to the California Display Network, which had a link pointing to technical info on flat panel technology. Since I currently earn my living writing graphics card and display drivers, I clicked through to see what I could learn.

I found an entry for an overview of digital visual interfaces, provided by Silicon Image. As I reviewed the headings of the slides, one entry stopped me cold: Conten t Protection Status. Content protection? In a flat panel?? Yup: "Implementation of DVI content protection is suitable for PCs and monitors." [emphasis mine]

Thus began an evening of link clicking and Google searches to find out what this off-handed remark could mean. The slide made mention of the 'CPTWG'. This is the Copy Protection Technical Working Group, a consortium of content providers (movie companies), consumer electronics manufacturers, and players in the IT industry. This is the same group that developed CSS for DVD players.

One paragraph from the above page is particularly disturbing:

CPTWG has focused until now only on "casual piracy [sic]", characterized as what a grandmother can do in her home with her DVD. Piracy [sic] requiring even the level of expertise (and equipment) of her grandson, who might be an EE student, has been excluded from consideration. There is a growing awareness that a broader content protection effort may be necessary.

The most recent meeting of the CPTWG was yesterday, 8 December, 1999. Their meeting announcements may be found here. According to the December meeting announcement, the next meetings will occur on 11 January, 2000, and 9 February, 2000. It costs $100 to attend.

The attendance roster from the November meeting (PDF file, sorry) lists a very interesting, and possibly worrying, mix of organizations. A partial list of representatives included:

• MPAA (Motion Picture Association of America),
• AFMA (American Film Marketing Association),
• Sony Pictures Entertainment,
• Universal Studios,
• Warner Bros.,
• Disney,
• Paramount,
• CEMA (Consumer Electronics Manufacturers Association),
• MEI (parent company to Panasonic), makers of consumer electronics,
• Pioneer, makers of consumer electronics,
• JVC, makers of consumer electronics,
• Philips, makers of consumer electronics and VLSI components (including video encoders),
• Sony, makers of consumer electronics, computers, and displays,
• Toshiba, makers of consumer electronics, computers, flat panels, disk drives, digital cameras, copiers, and laser printers,
• NEC, makers of computers, displays, printers, and telecomm equipment,
• Hewlett Packard, makers of computers, printers, and testing/measuring equipment (oscilloscopes, logic analyzers, etc.),
• Quantum, makers of disk drives,
• IBM, makers of computers, disk drives, and bunches of other stuff,
• Compaq, makers of computers,
• Apple Computer, makers of computers,
• ATI Technologies, makers of PC graphics cards,
• Dolby Labs, creators and licensors of audio enhancement technologies,
• Intel, makers of microprocessors, motherboard controllers, and graphics and peripheral chips,
• Microsoft, software market monopolists,
• Dow Chemical (I have no idea why they're here),
• A number of law firms.

If you download the roster and read closely, you'll see every major piece of your computer represented. There is no doubt that at least one part of your computer -- your CPU, your RAM, your disk drive, your graphics card, your monitor -- is manufactured by one of these companies.

If you look further still, you'll see there are no consumer advocacy groups listed.

What are they all working toward? Quite simply, to prevent you from using your lawfully obtained digital material in any way they don't want.

Here's one example of how they'll do it: If you've visited Fry's or CompUSA recently, you'll notice that full-size flat panel displays are starting to appear. Currently, most of these displays are based on the old VGA analog signals, which are converted into the digital signals needed by the panels. The Digital Display Working Group is working on a new connector and signalling standard called Digital Visual Interface (DVI) that will allow computer displays to go all-digital. You won't need a DAC on the video card; the digital signals will be fed straight through to the display. Image fidelity will be much higher, since there won't be any intervening DAC/ADC conversions. Version 1.0 of the standard has been published and is available for download (PDF format). The DVI spec currently does not stipulate copy protection measures. However, plans are in the works to incorporate it.

Intel is one of the primary contributors to this effort. On Intel's developer site, they have some papers on copy protection for IEEE 1394 (Firewire) digital streams. In two separate articles, 1394-based Digital Content Protection: an Intel Proposal, and Content Protection for IEEE 1394 Serial Buses (the latter being a Powerpoint presentation masquerading as a PDF file), Intel outlines its proposal for protecting digital content over Firewire. By using cryptographic authentication techniques, a device offering digital content will "handshake" with other devices on the bus to assure that digital data is only received by, "compliant devices." In a revised overview of the proposal, IDF Talk: Content Protection for the IEEE 1394 Bus, Intel offers concrete implementation details, including:

• DSS (Digital Signature Standard)
• Diffie-Hellman key exchange for device authentication,
• Blowfish cipher for content encryption, with a keylength of 32-128 bits,
• Digital watermarking techniques to declare "rights" (right to playback, right to copy, etc.) to the receiving device.

The full proposal (currently version 0.91), with lots of technical detail, is mirrored on CPTWG's site (the links to Intel's site don't work).

Intel's proposal also recommends that the copy protection system be field-upgradeable to thwart ongoing attacks, and that it should be possible to revoke (read: disable) a device determined to be "compromised." (The tone of the proposals is also interesting. It's previously been thought that, because of USB, Intel is hostile to IEEE 1394. Yet these proposals suggest that Intel's quite enthusiastic about 1394... Once copy protection is incorporated.)

Intel's proposal mentions only IEEE 1394. However, it also mentions that there's nothing preventing the technique being applied generally to any bi-directional link. So for all occurrences of '1394', substitute 'DVI', and you've got an idea of what to look forward to in your new digital monitor. And your new DVD player. And your new HDTV set. And your new USB speakers.

Intel goes even further in their paper, A Framework for DVD-Audio Content Protection. In it, the author suggests that DVD-Audio recorders permanently remember the IRSC (International Standard Recording Code) of every song the device is asked to copy, so that it may only be copied once, period. They go on to suggest that the recorder could have a modem built-in to authorize (read: purchase) the ability to make additional copies.

In short, through this industry consortium, Hollywood proposes to exert control over every link in the digital chain, from the digital camera, to the disk drive, to the CPU, to the graphics card, to your display. They will decide what rights you have. Even if a court decides Fair Use includes multiple copies for personal use (such as assembling a video montage), it won't matter. Your computer will still refuse to make the copies (and probably fink on you, as well).

This coordinated effort is ostensibly to combat unsanctioned copying (which the industry chronically refers to incorrectly as 'theft' and 'piracy'). However, no one has ever been able to provably quantify the value of unrealized sales due to such copying. All dollar estimates that have been published are just that: estimates, based on idealized extrapolations of what-if scenarios. Moreover, although the industry claims to "lose" billions every year, they continue to post record profits. Finally, despite the proliferation of CDR drives and the Internet, most unrealized sales are the result of organized mass counterfeiting rings, not casual copying. None of the proposed methods I've seen appear to thwart mass counterfeiting at all. So clearly there's some other reason for all this.

The thing that puzzles me most is why the computer and consumer electronics industries haven't told Hollywood to take a hike. Intel's copy protection proposals state, in bold letters, "No content protection = No Hollywood content." This belief is taken as axiomatic by all the players, and appears to be the driving force behind the entire effort. This belief is also false.

Audio on CDs are recorded as plaintext, and the music industry continues to earn rapacious profits. Even the with the advent of CDRs, no music industry executive in his right mind would suggest dropping CD sales and going strictly with cassettes and vinyl. If nothing else, the manufacturing costs for CDs are lower than those for cassettes and vinyl. Likewise, DVDs are tremendously cheaper to produce than videotapes. Videotape duplication is a labor-intensive process; DVDs can be stamped out automatically. The savings in cost-of-goods alone would more than balance against any unrealized sales from casual copying. Corporate shareholders, always mindful of the bottom line, will also demand that the studios move to the cheaper, higher-quality process, copy protected or not.

The fact is that the computer and electronics firms are in the driver's seat, and are free to dictate how the new digital formats will work. Hollywood will use whatever format becomes popular, whether it has copy protection or not. They may grumble about it, but they'll use it. The economics afford them little choice.

We are only now beginning to explore the social and ethical consequences of a Star Trek-like universe where everything can be infinitely duplcated at zero cost. We have no idea where things will end up. But now is not the time to start erecting electronic walls and imposing artificial scarcity. The ignoble and richly-deserved death of DIVX showed -- fairly unequivocally, I thought -- that consumers want to make free, fair use of their digital media, without interference from outside. I believe its death reinforces the future toward which we've been pushing for centuries: Increased abundance at reduced cost.

Nevertheless, the CPTWG and the organizations supporting it are blindly moving forward. It may turn out it's impossible to dam the ocean, but they're gearing up to give it one hell of a try. We can only hope that the lesson of DIVX will be repeated until it is learned.

Schwab

I submitted this to Slashdot's Your Rights Online section some weeks ago, but it was rejected. I think the article is pertinent here.

Recent stories on Slashdot have told of the ongoing "tennis match" between digital content providers versus consumers and technically skilled people. The recent cracking of DVD's Content Scrambling System (CSS) lent ammunition to the opinion held by computing professionals and users that copy protection systems are doomed to fail. The effort has been likened to building a dam against the ocean; a foolish and useless exercise. In Slashdot discussion fora, the point has often been raised, "If you can perceive it, you can copy it. What are they going to do, encrypt the bits all the way to the speaker/electron gun?" If the Copy Protection Technical Working Group gets its way, that is precisely what's going to happen.

I received a piece of email spam today, which actually turned out to be useful (probably the only time that's ever happened anywhere). It directed me to a flat panel display industry group. Among others, one of the links pointed to the California Display Network, which had a link pointing to technical info on flat panel technology. Since I currently earn my living writing graphics card and display drivers, I clicked through to see what I could learn.

I found an entry for an overview of digital visual interfaces, provided by Silicon Image. As I reviewed the headings of the slides, one entry stopped me cold: Conten t Protection Status. Content protection? In a flat panel?? Yup: "Implementation of DVI content protection is suitable for PCs and monitors." [emphasis mine]

Thus began an evening of link clicking and Google searches to find out what this off-handed remark could mean. The slide made mention of the 'CPTWG'. This is the Copy Protection Technical Working Group, a consortium of content providers (movie companies), consumer electronics manufacturers, and players in the IT industry. This is the same group that developed CSS for DVD players.

One paragraph from the above page is particularly disturbing:

CPTWG has focused until now only on "casual piracy [sic]", characterized as what a grandmother can do in her home with her DVD. Piracy [sic] requiring even the level of expertise (and equipment) of her grandson, who might be an EE student, has been excluded from consideration. There is a growing awareness that a broader content protection effort may be necessary.

The most recent meeting of the CPTWG was yesterday, 8 December, 1999. Their meeting announcements may be found here. According to the December meeting announcement, the next meetings will occur on 11 January, 2000, and 9 February, 2000. It costs $100 to attend.

The attendance roster from the November meeting (PDF file, sorry) lists a very interesting, and possibly worrying, mix of organizations. A partial list of representatives included:

• MPAA (Motion Picture Association of America),
• AFMA (American Film Marketing Association),
• Sony Pictures Entertainment,
• Universal Studios,
• Warner Bros.,
• Disney,
• Paramount,
• CEMA (Consumer Electronics Manufacturers Association),
• MEI (parent company to Panasonic), makers of consumer electronics,
• Pioneer, makers of consumer electronics,
• JVC, makers of consumer electronics,
• Philips, makers of consumer electronics and VLSI components (including video encoders),
• Sony, makers of consumer electronics, computers, and displays,
• Toshiba, makers of consumer electronics, computers, flat panels, disk drives, digital cameras, copiers, and laser printers,
• NEC, makers of computers, displays, printers, and telecomm equipment,
• Hewlett Packard, makers of computers, printers, and testing/measuring equipment (oscilloscopes, logic analyzers, etc.),
• Quantum, makers of disk drives,
• IBM, makers of computers, disk drives, and bunches of other stuff,
• Compaq, makers of computers,
• Apple Computer, makers of computers,
• ATI Technologies, makers of PC graphics cards,
• Dolby Labs, creators and licensors of audio enhancement technologies,
• Intel, makers of microprocessors, motherboard controllers, and graphics and peripheral chips,
• Microsoft, software market monopolists,
• Dow Chemical (I have no idea why they're here),
• A number of law firms.

If you download the roster and read closely, you'll see every major piece of your computer represented. There is no doubt that at least one part of your computer -- your CPU, your RAM, your disk drive, your graphics card, your monitor -- is manufactured by one of these companies.

If you look further still, you'll see there are no consumer advocacy groups listed.

What are they all working toward? Quite simply, to prevent you from using your lawfully obtained digital material in any way they don't want.

Here's one example of how they'll do it: If you've visited Fry's or CompUSA recently, you'll notice that full-size flat panel displays are starting to appear. Currently, most of these displays are based on the old VGA analog signals, which are converted into the digital signals needed by the panels. The Digital Display Working Group is working on a new connector and signalling standard called Digital Visual Interface (DVI) that will allow computer displays to go all-digital. You won't need a DAC on the video card; the digital signals will be fed straight through to the display. Image fidelity will be much higher, since there won't be any intervening DAC/ADC conversions. Version 1.0 of the standard has been published and is available for download (PDF format). The DVI spec currently does not stipulate copy protection measures. However, plans are in the works to incorporate it.

Intel is one of the primary contributors to this effort. On Intel's developer site, they have some papers on copy protection for IEEE 1394 (Firewire) digital streams. In two separate articles, 1394-based Digital Content Protection: an Intel Proposal, and Content Protection for IEEE 1394 Serial Buses (the latter being a Powerpoint presentation masquerading as a PDF file), Intel outlines its proposal for protecting digital content over Firewire. By using cryptographic authentication techniques, a device offering digital content will "handshake" with other devices on the bus to assure that digital data is only received by, "compliant devices." In a revised overview of the proposal, IDF Talk: Content Protection for the IEEE 1394 Bus, Intel offers concrete implementation details, including:

• DSS (Digital Signature Standard)
• Diffie-Hellman key exchange for device authentication,
• Blowfish cipher for content encryption, with a keylength of 32-128 bits,
• Digital watermarking techniques to declare "rights" (right to playback, right to copy, etc.) to the receiving device.

The full proposal (currently version 0.91), with lots of technical detail, is mirrored on CPTWG's site (the links to Intel's site don't work).

Intel's proposal also recommends that the copy protection system be field-upgradeable to thwart ongoing attacks, and that it should be possible to revoke (read: disable) a device determined to be "compromised." (The tone of the proposals is also interesting. It's previously been thought that, because of USB, Intel is hostile to IEEE 1394. Yet these proposals suggest that Intel's quite enthusiastic about 1394... Once copy protection is incorporated.)

Intel's proposal mentions only IEEE 1394. However, it also mentions that there's nothing preventing the technique being applied generally to any bi-directional link. So for all occurrences of '1394', substitute 'DVI', and you've got an idea of what to look forward to in your new digital monitor. And your new DVD player. And your new HDTV set. And your new USB speakers.

Intel goes even further in their paper, A Framework for DVD-Audio Content Protection. In it, the author suggests that DVD-Audio recorders permanently remember the IRSC (International Standard Recording Code) of every song the device is asked to copy, so that it may only be copied once, period. They go on to suggest that the recorder could have a modem built-in to authorize (read: purchase) the ability to make additional copies.

In short, through this industry consortium, Hollywood proposes to exert control over every link in the digital chain, from the digital camera, to the disk drive, to the CPU, to the graphics card, to your display. They will decide what rights you have. Even if a court decides Fair Use includes multiple copies for personal use (such as assembling a video montage), it won't matter. Your computer will still refuse to make the copies (and probably fink on you, as well).

This coordinated effort is ostensibly to combat unsanctioned copying (which the industry chronically refers to incorrectly as 'theft' and 'piracy'). However, no one has ever been able to provably quantify the value of unrealized sales due to such copying. All dollar estimates that have been published are just that: estimates, based on idealized extrapolations of what-if scenarios. Moreover, although the industry claims to "lose" billions every year, they continue to post record profits. Finally, despite the proliferation of CDR drives and the Internet, most unrealized sales are the result of organized mass counterfeiting rings, not casual copying. None of the proposed methods I've seen appear to thwart mass counterfeiting at all. So clearly there's some other reason for all this.

The thing that puzzles me most is why the computer and consumer electronics industries haven't told Hollywood to take a hike. Intel's copy protection proposals state, in bold letters, "No content protection = No Hollywood content." This belief is taken as axiomatic by all the players, and appears to be the driving force behind the entire effort. This belief is also false.

Audio on CDs are recorded as plaintext, and the music industry continues to earn rapacious profits. Even the with the advent of CDRs, no music industry executive in his right mind would suggest dropping CD sales and going strictly with cassettes and vinyl. If nothing else, the manufacturing costs for CDs are lower than those for cassettes and vinyl. Likewise, DVDs are tremendously cheaper to produce than videotapes. Videotape duplication is a labor-intensive process; DVDs can be stamped out automatically. The savings in cost-of-goods alone would more than balance against any unrealized sales from casual copying. Corporate shareholders, always mindful of the bottom line, will also demand that the studios move to the cheaper, higher-quality process, copy protected or not.

The fact is that the computer and electronics firms are in the driver's seat, and are free to dictate how the new digital formats will work. Hollywood will use whatever format becomes popular, whether it has copy protection or not. They may grumble about it, but they'll use it. The economics afford them little choice.

We are only now beginning to explore the social and ethical consequences of a Star Trek-like universe where everything can be infinitely duplcated at zero cost. We have no idea where things will end up. But now is not the time to start erecting electronic walls and imposing artificial scarcity. The ignoble and richly-deserved death of DIVX showed -- fairly unequivocally, I thought -- that consumers want to make free, fair use of their digital media, without interference from outside. I believe its death reinforces the future toward which we've been pushing for centuries: Increased abundance at reduced cost.

Nevertheless, the CPTWG and the organizations supporting it are blindly moving forward. It may turn out it's impossible to dam the ocean, but they're gearing up to give it one hell of a try. We can only hope that the lesson of DIVX will be repeated until it is learned.

Schwab