IT Jobs
Vista crippled by content protection
Collateral damage from Vista suicide note.
By Chris Mellor, Techworld
Published: 14:11 GMT, 27 December 06
PC users around the globe may find driver software is stopped from working by Vista if it detects unauthorised content access. Peter Guttman, a security engineering researcher at New Zealand's university of Auckland, has written A Cost Analysis of Windows Vista Content Protection. He reckons Vista is trying to achieve the impossible by protecting access to premium content. Users will find their PCs' compromised by the persistent and continuous content access checks carried out by Vista.
Gutman thinks these checks and the associated increased in multimedia card hardware costs make Vista's content protection specification 'the longest suicide note in history.'
The core elements in Vista have been designed to protect access to premium content. The design requires changes in multimedia cards before Microsoft will support them for Vista use.
Content that is protected by digital rights management (DRM) must be sent across protected interfaces. This means cards using non-protected interfaces can't be used by Vista PCs.
Disabling and degrading
Vista is disadvantaging high-end audio and video systems by openly disabling devices. The most common high-end audio output interface is S/PDIF (Sony/Philips Digital Interface Format) which doesn't have any content protection. It must be disabled in a Vista system when DRM-protected content is being played. Equally a high-end component video interface (YPbPr) also has no content protection and must be disabled when protected video is being played.
- Vista covertly degrades playback quality. PC voice communications rely on automatic echo cancellation (AEC) in order to provide acceptable voice quality. This requires feeding back a sample of the audio mix into the echo cancellation subsystem, which isn't permitted by Vista's content protection scheme. This lowers PC voice communication quality because echo effects will still be present.
- This overt and covert degrading of quality is dynamic, not consistent. Whenever any audio derived from premium content is played on a Vista PC, the disabling of output devices and downgrading of signal quality takes place. If the premium content then fades away the outputs are re-enabled and signal quality climbs back up. Such system behaviour today indicates a driver error. With Vista it will be normal behaviour.
- Vista has another playback quality reduction measure. It requires that 'any interface that provides high-quality output degrade the signal quality that passes through it if premium content is present. This is done through a "constrictor" that downgrades the signal to a much lower-quality one, then up-scales it again back to the original spec, but with a significant loss in quality.' If this happens with a medical imaging application then artifacts introduced by the constrictor can 'cause mis-diagnoses and in extreme cases even become life-threatening.'
CPU cycle guzzling
The O/S will use much more of a PC's CPU resource because 'Vista's content protection requires that devices (hardware and software drivers) set so-called "tilt bits" if they detect anything unusual ... Vista polls video devices on each video frame displayed in order to check that all of the grenade pins (tilt bits) are still as they should be.'
Also 'In order to prevent tampering with in-system communications, all communication flows have to be encrypted and/or authenticated. For example content sent to video devices has to be encrypted with AES-128.' Encryption/decryption is known to be CPU-intensive
Device drivers in Vista are required to poll their underlying hardware every 30ms - thirty times a second - to ensure that everything appears correct.
It is apparent that Vista is going to use very much more of a PC's resources than previous versions of Windows and degrade multi-media playback quality unless the user has purchased premium content from a Microsoft-approved resource.
Such over-reaching by Microsoft could prove to be the catalyst needed to spur increased takeup of Linux desktop operating software, or of Apple's Mac OS.
.gif)
Add your commentComments
DENNIS | Published: 12:12 GMT, 21 October 2008
i want drivers for SPDIF...THANKS:)
Downgrade? | Published: 05:15 GMT, 30 May 2008
Why on earth would you purposefully down grade the quality of your customers experience? That's like going to a bar and right before the bartender hands me a beer she spits in it. Why? Because I did not by the particular beer that the bar is promoting that night!! Would I ever go to that bar again? No.
Pirahna | Published: 14:11 GMT, 07 February 2008
I've worked with computers for over a quarter century. I don't have Vista, but I've worked on several PC's that are new and came with Vista preinstalled. I've heard rumors that Microsoft is entertaining a name change to Microboned. More appropriate. Just about the time most of the bugs in XP are worked out, they come up with an OS that is very bad juju. What would you rather do? 1) Work/Troubleshoot Vista? 2) Get hit in the head with a brick? 3) A swift kick in the nads with a steel-toed boot? All options suck, but I think 3 is the lesser of all the evil choices. I'm going tonight to work on Vista that has popped up with nothing but errors when the client tried to create a CD (Acrobat Reader, Digital Camera, Video Driver, and 8 other software/driver errors - one after another (close one, another one pops up)). Pray that the demons be excised.
BIrmen | Published: 07:22 GMT, 24 January 2008
Yes I think all microsoft softwares big brother for world.
David W | Published: 12:20 GMT, 22 November 2007
When it comes to Vista, run, run fast, run hard, don't look back. Viva XP! Vista is the first stock-installed OS for which I've seen *consistent* stories and MB posts asking for ways to drop back down to XP. Heck, even Dell went back to XP offerings on some of its laptops. This comes from a developer following Windows/MS OS evolution over 20 years, and does Linux as well. If you like the pretty features in Vista, that's great, but understand it is a *massive* resource hog...
Dan | Published: 23:42 GMT, 11 October 2007
@Ray: Ditto, we spent 8 hours on the phone with Microsoft tech support and 6 hours with Intuit tech support trying to get Quickbooks 2007 running on a BRAND NEW, CLEAN INSTALL of Vista. The fix? XP Pro. So far, we've upgraded 8 Vista computers to XP or Linux because of user troubles.
Dragunov | Published: 22:55 GMT, 13 August 2007
I'll just use XP thank you!
Ray | Published: 14:56 GMT, 30 April 2007
Had vista for a week, spent big bucks on software that is labeled to run on vista but doesnt, or is slower then dirt. DVD playback looks bad, system hangs a lot, re-boot, re-boot. Just sent the laptop back to HP. Good-bye MS PS, I work on puters for a living , I pity the avg. joe and vista