How to decrypt DVD protections?

DVD protections type


DVD Copy Ultimate is a powerful DVD cloner and ripper software, it can easily decrypt DVD protections and make backup for DVDs. There are many types fo DVD protections. This article will give a breif introduction of these DVD protections and introduce how DVD Copy Ultimate can decrypt them.


1.Region Code

DVD video discs may be encoded with a region code restricting the area of the world in which they can be played. Discs without region coding are called all region or region 0 discs.

The commercial DVD player specification requires that a player to be sold in a given place not play discs encoded for a different region (region 0 discs are not restricted). The purpose of this is to allow motion picture studios to control aspects of a release, including content, release date, and, especially, price, according to the region. Many DVD players are or can be modified to be region-free, allowing playback of all discs.


2.Region Code Enhanced (RCE)

Region Code Enhanced, also known as just "RCE" or "REA", this was a retroactive attempt to prevent the playing of one region's discs in another region, even if the disc was played in a region free player. The scheme was deployed on only a handful of discs. The disc contained the main programme material region coded as region 1. But it also contained a short video loop of a map of the world showing the regions, which was coded as region 2, 3, 4, 5, and 6. The idea was that when the disc was played in a non-region 1 player, the player would default to playing the material for its native region. This played the map, which was impossible to escape from, as the user controls were disabled.


3.Analog Protection System (APS)

The Analog Protection System (APS), also known as Copyguard, is a DVD copy prevention system originally developed by Macrovision. Video tapes copied from DVDs encoded with APS become garbled and unwatchable. The process works by adding pulses to analog video signals to negatively impact the AGC circuit of a recording device. In digital devices changes to the analog video signal are created by a chip that converts the digital video to analog within the device. In DVD players trigger bits are created during DVD authoring to inform the APS that it should be applied to DVD players analog outputs or analog video outputs on a PC while playing back a protected DVD-Video disc. In set top boxes trigger bits are incorporated into Conditional Access Entitlement Control Messages (ECM) in the stream delivered to the STB. In VHS alterations to the analog video signal are added in a Macrovision-provided "processor box" used by duplicators.


4.Content Scramble System (CSS)

Content Scramble System (CSS) is a Digital Rights Management (DRM) scheme used on almost all commercially produced DVD-Video discs. It utilizes a relatively weak, proprietary 40-bit stream cipher algorithm. The system was introduced around 1996 and has subsequently been compromised.

The CSS key sets are licensed by the DVD Copy Control Association to manufacturers who incorporate them into products such as DVD movie releases, drives & players. Most DVD players are equipped with a CSS Decryption module. CSS key is a collective term for authentication key, disc keys, player keys, title keys, secured disk key set, and/or encrypted title keys.


5.User Operation Prohibition(UOP) 

The user operation prohibition (abbreviated UOP) is a form of digital rights management used on video DVD discs. Most DVD players prohibit the viewer from performing a large majority of actions during sections of a DVD that are protected or restricted by this feature, and will display the no symbol or a message to that effect if any of these actions are attempted. It was intended for copyright notices and the ubiquitous (at least in the United States) FBI warning. Some publishers run "protected" (i.e., "unskippable") commercials on their DVDs, which is widely seen by consumers as an abuse of the feature.


6.Sony ARccOS Protection

ARccOS is a copy-protection system developed by Sony used on some DVDs. Designed as an additional layer to be used in conjunction with Content Scramble System (CSS), the system deliberately creates corrupted sectors on the DVD, which cause copying software to produce errors. Allegedly, "Normal" DVD players do not read these sectors since they follow a set of instructions encoded on the disc telling them to skip them. However, many users with "normal" DVD players still report unplayable discs, and in some cases total lock-up of their players. Less sophisticated DVD copying programs do not follow these instructions and instead try to read every sector on the disk sequentially, including the bad ones.


7.Analog CPS (Macrovision)

Videotape (analog) copying is prevented with a Macrovision 7.0 or similar circuit in every player. Macrovision may show up as stripes of color, distortion, rolling, black & white picture, and dark/light cycling. Macrovision creates problems for most TV/VCR combos (see 3.2.1) and some high-end equipment such as line doublers and video projectors.


8.CGMS

Each disc contains information specifying if the contents can be copied. This is a serial copy generation management system (SCMS) designed to prevent initial copies or generational copies (copies of copies). The CGMS information is embedded in the outgoing video signal. For CGMS to work, the equipment making the copy must recognize and respect the CGMS information. The analog standard (CGMS-A) encodes the data on NTSC line 21 (in the XDS service) or line 20. CGMS-A is recognized by most digital camcorders and by some computer video capture cards (they will flash a message such as "recording inhibited"). Professional time-base correctors (TBCs) that regenerate lines 20 and 21 will remove CGMS-A information from an analog signal. The digital standard (CGMS-D) is included in DTCP and HDMI for digital connections such as IEEE 1394/FireWire. See subsections 6 and 7 below.

 

9.Content Protection for Prerecorded Media (CPPM)

CPPM is used only for DVD-Audio. It was developed as an improvement on CSS. Keys are stored in the lead-in area, but unlike CSS no title keys are placed in the sector headers. Each volume has a 56-bit album identifier, similar to a CSS disc key, stored in the control area. Each disc contains a media key block, stored in a file in the clear on the disc. The media key block data is logically ordered in rows and columns that are used during the authentication process to generate a decryption key from a specific set of player keys (device keys). As with CSS, the media key block can be updated to revoke the use of compromised player keys. If the device key is revoked, the media key block processing step will result in an invalid key value. The authentication mechanism is the same as for CSS, so no changes are required to existing drives. A disc may contain both CSS and CPPM content if it is a hybrid DVD-Video/DVD-Audio disc.


10.Content Protection for Recordable Media (CPRM)

CPRM is a mechanism that ties a recording to the media on which it is recorded. It is supported by some DVD recorders, but not by many DVD players. Each blank recordable DVD has a unique 64-bit media ID etched in the BCA (see 3.11). When protected content is recorded onto the disc, it can be encrypted with a 56-bit C2 (Cryptomeria) cipher derived from the media ID. During playback, the ID is read from the BCA and used to generate a key to decrypt the contents of the disc. If the contents of the disc are copied to other media, the ID will be absent or wrong and the data will not be decryptable.

 

How to Watch DVD with Region Code Freely

As a consumer, the major part of visitors here, you are definitely looking for some effective method to handle such trouble. To buy a DVD player which has the same code as the disc is ok. For example, if you are in USA, but your brother is in UK at present and he sends UK DVDs to you frequently, you can consider to buy a Region 2 (UK standard) DVD player from eBay or Amazon very easily. However, this way will cost you lots of money if you have the possibility to receive DVD worldwide, since there are mainly 6 kinds of codes/players.

Here we introduce a way to save your money -- use Any DVD Cloner to make a code-free DVD backup copy, without any region code or RCE technology.

This DVD Cloner is able to perform various cloning actions, such as backup any special feature clips/DVD menu/audio language/subtitle language, explore DVD structure, burn ISO image file to DVD-R/RW, clone DVD backup folder to DVD-R/RW, erase rewriteable DVD-RW, control load/eject action of DVD burner, and more.

DVD Copy Ultimate is a versatile and easy-to-use DVD movie copying, DVD backup software to copy DVD movie to DVD/computer with 1:1 ratio and super high DVD copy speed, compress DVD9 to DVD5 with great quality, copy DVD to DVD folder or ISO file, and preview DVD movie when DVD copying. It is the best choice to make backup copies of any movie DVDs.

Any DVD Cloner is the perfect DVD backup software for your favorite films. Backup your DVDs on another DVD or on your hard drive - either way, it can be done with just a few clicks. You'll be impressed by the excellent video and audio quality of your DVD backups, and by the speed with which you can create them!

No matter what kind of region-coded DVD you have, DVD9 or DVD5, the cloning steps are the same as others. Just follow this tutorial page to make code-free DVD by yourself!

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