BD +

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BD + is part of the digital rights management system of the Blu-ray Disc . It was developed by the US company Cryptography Research Inc. and is based on their concept of SPDC (Self-Protecting Digital Content, German: self-protecting digital content). BD + played an important role in the format war between HD DVD and Blu-ray Disc. Many film studios cited BD + as the reason they preferred Blu-ray Disc to HD DVD.

On November 19, 2007, Macrovision announced that it would purchase BD + technology (including patents and software) for $ 45 million from Cryptography Research Inc.

Skills

BD + is a small virtual machine that resides in license-compliant Blu-ray players. It allows content providers to run programs that

  • check the Blu-ray player to see whether the software or firmware has been changed. Each of the BDA has a recognition key, provide licensed software or hardware player so that the BDSVM ( B lu-Ray D isc S ecure V irtual M achine) the stream files decrypted.
  • ensure that the player's keys have not been changed.
  • Execute native code to fill in loopholes in a potentially unsafe system.
  • decrypt the stream files. The M2TS files are encrypted with an algorithm that only the BDSVM knows. If the BDSVM does not run or refuses to run, the stream files cannot be played.

Bypassing

The program AnyDVD HD from the Caribbean-based software manufacturer SlySoft , which removes copy protection measures from music and film data carriers ( music CDs , video DVDs , HD DVDs and Blu-ray discs ), has been supported since March 19, 2008 (version 6.4.0.0 ) the removal of the BD + copy protection. In principle, the files can then also be used under free operating systems such as B. Linux can be played. There is also the option of converting them to other formats and playing them on a portable video player, for example. However, AnyDVD HD is currently only available for Microsoft Windows .

It is possible for the manufacturer to modify the copy protection in such a way that it can no longer be bypassed by the same version of AnyDVD HD. As with all previous copy protection mechanisms, it amounts to a cat-and-mouse game between manufacturers and crackers . A later modified version of BD +, which appeared in the last third of 2008, could only be overridden with version 6.5.0.2, which appeared at the end of December 2008.

On October 28, 2008, it was announced in the relevant Internet forum Doom9 that the film The Day After Tomorrow could also be decoded under Linux using a self-implementation of the BD + VM. A free and operating system-independent BD + implementation that works for the majority of Blu-ray publications protected with BD + does not yet exist.

In August 2009, the manufacturer of the DVDFab program collection announced that it would also integrate BD + copy protection bypassing into its products in the future. However, a first version with BD + support was only released on November 6, 2009. Like AnyDVD HD, DVDFab is commercial and only available for Microsoft Windows.

On May 23, 2010, Aunsoft released version 1.0 of its Blu-ray Ripper software , which can also bypass the BD + copy protection.

swell

  1. Christian Klaß: Slysoft outsmarts BD + with AnyDVD HD again. golem.de , December 29, 2008, accessed January 5, 2009 .
  2. Announcement of the hack on Doom9
  3. Kunshan, Jiangsu: Aunsoft Blu-ray Ripper Now With Avatar BD + Support. May 26, 2010, accessed June 8, 2010 .

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