Andre "Linux IDE Guy" Hedrick on Proposed CPRM in IDE Drives
The T13 committee is considering a proposal to embed a copy control system called CPRM in ATA hard drives. The proposed modifications to the ATA specification are available online.
Since the CPRM specification is available only on paper, can you describe CPRM briefly for us?
My understanding and best guess is the Motion Picture Association wants to create a "pay-per-view" infrastructure for digital content on the Internet.
We currently have : theaters pay per view video-rental/purchase not pay per view cable not pay per view dish-networks not pay per view They appear to want : Internet downloads pay per view w/ counter more pay per view
Basically they may want to charge you for every usage of content, regardless of whether you purchased it already.
What is meant by a "CPRM application" and "CPRM content?"
CPRM content: a file which paranoid people do not want you to have the ablity to view/use how you wish.
CPRM application: a program/tool/driver that you pay a license fee to obtain or create, regardless. It is the barrier used to write or read encrypted content to prevent general use of that which is yours.
CPRM layer on ATA device <-> driver(host/os) <-> CPRM application
The application will generally have the decoder.
How will CPRM affect an ordinary desktop or server Linux user?
If it is never allowed to be executed, no effect. If it is executed, hope you backed up your stuff first.
Will I be able to install and run Linux normally on a CPRM drive if I choose not to use any CPRM applications?
Yes, in principle. On a PC, there are 31 seconds that pass when you push the power button on, during which the BIOS is in control. Without very special tricks that I have not created yet, but have an idea how to, you can not control what happens during that window before Linux takes over.
Will you need to modify the Linux IDE subsystem to handle CPRM drives?
Initially Linux may have to filter the return content of the IDENTIFY page from the device to prevent checking of the feature. An application that tries to use CPRM will abort.
The CPRM command-set is most likely to be in the "RAW-IO" class of device access. Only the contiguous nature of the content to be placed on the media only makes this method of access practical. Linux does not support RAW-IO video streaming to date.
Would you need to modify the Linux IDE subsystem if CPRM applications for Linux became available?
CPRM might require changes to: ./linux/fs/* && ./linux/block/??*.x && ./linux/ide/ide-*.x && ./linux/cdrom/cdrom.x && ./linux/scsi/??*.x &&
I just do not know the depth of the mess that would be needed to support it.
Why will CPRM force some embedded Linux vendors to rewrite their software?
They will be required to write an entire ATA driver replacement and any other filesystem layer needed to handle the calls. These can only be implemented as loadable modules, if the terms of GPL are followed.
Will dd if=/dev/hda of=/dev/hdb still work?
Yes, but the data may transfer in its encrypted form, so you can not read it or recover it to a different drive.
A dd-cprm program to copy the data unencrypted would have to exist and this is what CPRM proponents do not want to happen.
Is there anything about CPRM that keeps you from making a copy of CD audio on your hard drive, using existing software?
Not that I know of yet, but remember that this is embedded in the device. If the device is CPRM enabled, it may only allow you to access the content with a CPRM tool. Now the game begins...the content is yours, but you can not use it.
Will you be able to completely disable CPRM at the driver level, so that a CPRM drive acts like a non-CPRM drive, even if CPRM applications try to send it CRPM commands?
In principle I can stop it in the driver if it goes throught the normal IO layers. All of this is dependent on making an exemption to the "Unix Policy of No Policies", to filter or block this command.
Are you the only voice of reason and freedom on the T13 committee, or are other members against CPRM too?
No, there was one other company that was against it, and they are Linux friendly. The majority were on the sidelines to get more advice on the issue. I can not name them yet because I need to get their permission.
What is the one thing that bothers you the most about the CPRM proposal?
The very nature of the feature set enable. There is a concatenation of the first five taskfile registers to create a 39-bit and not a 40-bit enable passcode. The last bit is defined as always 0. Thus this leads one to question if there is a back door when the last bit is set to 1 and the other 39 bits are set to a certain value. Is it possible for the LC4 gang to enable certain undocumented features?
|Dynamic DNS—an Object Lesson in Problem Solving||May 21, 2013|
|Using Salt Stack and Vagrant for Drupal Development||May 20, 2013|
|Making Linux and Android Get Along (It's Not as Hard as It Sounds)||May 16, 2013|
|Drupal Is a Framework: Why Everyone Needs to Understand This||May 15, 2013|
|Home, My Backup Data Center||May 13, 2013|
|Non-Linux FOSS: Seashore||May 10, 2013|
- RSS Feeds
- Making Linux and Android Get Along (It's Not as Hard as It Sounds)
- Using Salt Stack and Vagrant for Drupal Development
- Dynamic DNS—an Object Lesson in Problem Solving
- New Products
- Validate an E-Mail Address with PHP, the Right Way
- Drupal Is a Framework: Why Everyone Needs to Understand This
- A Topic for Discussion - Open Source Feature-Richness?
- Download the Free Red Hat White Paper "Using an Open Source Framework to Catch the Bad Guy"
- Tech Tip: Really Simple HTTP Server with Python
- Keeping track of IP address
13 min 44 sec ago
- Roll your own dynamic dns
5 hours 27 min ago
- Please correct the URL for Salt Stack's web site
8 hours 38 min ago
- Android is Linux -- why no better inter-operation
10 hours 53 min ago
- Connecting Android device to desktop Linux via USB
11 hours 22 min ago
- Find new cell phone and tablet pc
12 hours 20 min ago
13 hours 49 min ago
- Automatically updating Guest Additions
14 hours 57 min ago
- I like your topic on android
15 hours 44 min ago
- This is the easiest tutorial
22 hours 20 min ago
Enter to Win an Adafruit Pi Cobbler Breakout Kit for Raspberry Pi
It's Raspberry Pi month at Linux Journal. Each week in May, Adafruit will be giving away a Pi-related prize to a lucky, randomly drawn LJ reader. Winners will be announced weekly.
Fill out the fields below to enter to win this week's prize-- a Pi Cobbler Breakout Kit for Raspberry Pi.
Congratulations to our winners so far:
- 5-8-13, Pi Starter Pack: Jack Davis
- 5-15-13, Pi Model B 512MB RAM: Patrick Dunn
- 5-21-13, Prototyping Pi Plate Kit: Philip Kirby
- Next winner announced on 5-27-13!
Free Webinar: Hadoop
How to Build an Optimal Hadoop Cluster to Store and Maintain Unlimited Amounts of Data Using Microservers
Realizing the promise of Apache® Hadoop® requires the effective deployment of compute, memory, storage and networking to achieve optimal results. With its flexibility and multitude of options, it is easy to over or under provision the server infrastructure, resulting in poor performance and high TCO. Join us for an in depth, technical discussion with industry experts from leading Hadoop and server companies who will provide insights into the key considerations for designing and deploying an optimal Hadoop cluster.
Some of key questions to be discussed are:
- What is the “typical” Hadoop cluster and what should be installed on the different machine types?
- Why should you consider the typical workload patterns when making your hardware decisions?
- Are all microservers created equal for Hadoop deployments?
- How do I plan for expansion if I require more compute, memory, storage or networking?