Tuesday, March 03, 2015
Search
  
Submit your own News for
inclusion in our Site.
Click here...
Breaking News
Google Says Android Lollipop Does Not Encrypt Data Due To Performance Issues
Apple To Release Fix For Freak Security Bug
Mozilla Brings Native Games to the Web
AMD Enters The Virtual Reality market With Liquid VR
SanDisk Creates New Storage Category With InfiniFlash All-Flash Storage System
HyperX Releases FURY And High-capacity Predator DDR4 Kits
ARM Announces Enlighten 3 Engine
Samsung Lost Top Position to Apple in Q4's Global Smartphone Market
Active Discussions
Need serious help!!!!
burning
nvidia 6200 review
Hello
Burning Multimedia in track 0
I'm lazy. Please help.
sanyo e6 camera
need help on some cd burning...
 Home > News > Optical Storage > Blu-ray...
Last 7 Days News : SU MO TU WE TH FR SA All News

Tuesday, October 04, 2005
Blu-ray Disc Marking System Explained


Recently published patents at the US Patent & Trademark Office could bring some light to the so-called "ROM Mark" protection layer of the Blu-Ray format.

Both HD DVD and Blu-Ray formats use the Advanced Access Contest System (AACS), in order to protect their data from unathorized replication, in an attempt to fight forgery. However, the Blu-Ray format additionally adds a second layer of protection called BD+, and a third layer called ROM Mark.

The Blu-Ray Disc Association has not publically given explanations on how the BD+ adds encryption key renewability to AACS key revocation. In addition, it has not said a word about how the ROM Mark works. The Association has officially said that the ROM Mark 'guards against mass production piracy or the mass duplication and sale of unauthorised copies of pre-recorded media' and also confirms that a digital signature is buried in the recording which can identify whether an individual disc was pressed from an authorised glass master.

Recently published patents from Robert Edmonds and Kevin McDonnell in California and Johann de Meulder in Belgium could give a give a strong clue to how BD Mark works.

Although every machine used to laser-cut a master disc is theoretically the same, the motor that spins the blank disc and moves the laser along a spiral track varies slightly in speed and precision. So if a digital marker is put in the middle of a recording, e.g. after exactly 60 minutes, its physical position on the master disc - and every disc then pressed - will be a unique fingerprint of the cutting machine.

The new system also buries some digital code on the disc which describes where the marker should be for the machine that created the master disc, for instance 25% round the thousandth turn of the spiral track. A modified player used by Customs checks the described position with the actual position. If they match, the disc is genuine. If they don't, the disc is a fake pressing.

To beat the system, pirates would have to reverse engineer the entire marker description and check process - which they are unlikely to have the time, expertise or money to do.

The patents can be found here.


Previous
Next
TSMC Announces Production-Ready 90nm X Architecture        All News        Sony's Video Server Records 8 TV Broadcasts Simultaneously
Japanese Studios to Release 35 titles in HD DVD Format     Optical Storage News      Traxdata DVD-R Dual Layer 4X

Source Link Get RSS feed Easy Print E-Mail this Message

Related News
Blu-ray Players Could Install Malware
4K Blu-ray Gets a Name: Ultra HD Blu-ray
Sony Unveils New Line of Blu-ray Disc Players
Panasonic Showcases Next Generation Blu-ray Disc Player at CES 2015
Blu-ray Movie Discs Used As Templates For Improving Solar Cell Performance
Pioneer Introduces New High-end Blu-ray Players At CEDIA
Blu-ray Discs For 4K Content And 4K Players Coming Next Year
New BD-DSD Blu-ray Disc Standard Allows Storing 200GB Of Data Per Disc
Optical Disc Sales Down
DVD And Blu-ray Discs Remain Popular in Britain
Blu-ray Disc Format Moving From Consumers To Professionals
Pioneer BDP-170 Blu-ray Disc Player Comes With Wi-Fi, Miracast And Youtube Connectivity

Most Popular News
 
Home | News | All News | Reviews | Articles | Guides | Download | Expert Area | Forum | Site Info
Site best viewed at 1024x768+ - CDRINFO.COM 1998-2015 - All rights reserved -
Privacy policy - Contact Us .