A rather difficult article at the register, for the hardware freaks...
IBM, Toshiba, Intel and Matsushita are busy with a new 'content protection system'. It protects data form being copied..
Hastening a rapid demise for the free copying of digital media, the next generation of hard disks is likely to come with copyright protection countermeasures built in. |
Technical committees of NCTIS, the ANSI-blessed standards body, have been discussing the incorporation of content protection currently used for removable media into industry-standard ATA drives, using proprietary technology originating from the 4C Entity. They're the people who brought you CSS2: IBM, Toshiba Intel and Matsushita.
The scheme envisaged brands each drive with a unique identifier at manufacturing time.
The proposals are already at an advanced stage: three drafts have already been discussed for incorporating CPRM (Content Protection for Recordable Media) into the ATA specification by the NCTIS T.13 committee. The committee next meets in February. If, as expected, the CPRM extensions become part of the ATA specification, copyright protection will be in every industry-standard hard disk by next summer, according to IBM.
So every harddisk get's it's own unique identifier...
But the system has some difficulties...
The ramifications are enormous. Although the benefit to producers is great - bringing the holy grail of secure content one step closer - the costs to consumers will be significant. For example, corporate IT departments will be unable to mix compliant and non-compliant ATA drives as they try to enforce uniform back up policies, we've discovered. Restoring personal backups to a different physical drive - a common enough occurrence when a disk has failed - will require authentication with a central server. Imaging software used by OEMs and large corporates to distribute one-to-many disk images will also need to be modified. |
How it works...
Today, CPRM is implemented on DVD and removable SD disks. But the SCSI and ATA/ATAPI proposals incorporate an extension of the scheme to allow the encryption to be used on hard drives, in addition to removable drives and ATAPI devices such as CD-ROMs and DVD drives. |
The proposal makes use of around a megabyte of read-only storage on each hard drive that isn't usually accessed by the end user for a "Media Key Block". According to research scientist Jeffrey Lotspiech of IBM's Almaden Research Lab, this is a matrix of 16 columns and some 3000 rows. A static "Media Unique Key" in a separate, hidden area of the drive, identifies the individual drive. Making use of broadcast encryption and one way key algorithms, would-be hackers face a daunting number of keys to break. CPRM adds new commands into the ATA specification.
But because the system makes use of the physical location on the device of the encrypted item, software designed for non-compliant drives will break in some circumstance when encrypted data files are moved.
"It requires both drives to be compliant when data is to move from one disk to another," says Lotspiech. "And a compliant application to get all that data to the new drive".
So a hard drive containing small individual containing non-copyable files of say, Gartner reports, will essentially be unrestorable using existing backup programs.
This will end the copying of data...
However the decision to make an organisation CPRM compliant. Free copying is no longer an option: |
"It's not up to us to determine or guess what the content provider might permit," says Ross. "Nothing will handcuff proper backup and restoring provided the content provider permits it. Some may not permit it - but what will the customers reaction be then?"
Well, quite. Clearly key management becomes an urgent priority when CPRM-aware drives are introduced next year, as CPRM-aware content will surely follow. The decision to go with CPRM in an organisation is also an all or nothing proposition - it can't be introduced gradually.
But for home users, the party's over. CRPM paves the way for CPRM-compliant audio CDs, and the free exchange of digital recordings will be limited to non-CPRM media.
Once a company has decided to use this new hardware, there is no way back. Also old drives are not compatible with the new ones.. As you will understand many people are against this. One company is Microsoft..
The Register understands there is fierce opposition to the plan from Microsoft and its OEM customers. Generating hundreds of thousands of images each week, the PC industry relies on data going from one master to many reliably and smoothly. Imaging programs face the same problem as restore software: the target disk isn't the same as the originator disk. Microsoft Redmond already has put in a counter-proposal that eschews low-level hardware calls. |
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Three possible paths lie ahead. CPRM may be bounced out of the T.x committees. Or manufacturers may choose not to implement it, and opt for an incomplete ATA or SCSI specification. This is deemed unlikely. Or thirdly, manufacturers may choose to implement the new command set, but not activate it.
Although it has some disadvantages, this is 'the most comprehensive mechanism for enforcing rights protection' the industry has ever seen, and the content providers see this as -the- solution. We will see what happens...
(As i said not a very easy article but very intresting... more information in the article from The Register)
