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What is CSS (in DVD Copy Protection)?

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What is CSS (in DVD)?

CSS (Content Scrambling System) is a DVD copy protection technology employed on almost all commercially produced DVD-Video discs. It is used on DVDs to encrypt the data so that only licensed DVD players can decode it then play the DVD content smoothly.

You may be not familiar with this copy protection term, but you may have experienced the troubles it brought: Most of the time when you want to backup a commercial DVD to computer, or re-burn to DVD discs to share with friends, you failed even though you are the owner of the DVD.

Why Employ CSS to DVD Production?

To answer this question, we need to firstly take a look at how does DVD store video/audio content and how do people copy DVD.

DVD video is stored as MPEG-2 format which is easily portable to a personal computer (as a .mpg or sometimes .vob file) where it can be viewed. So it can also be easily copied. Originally, CSS is employed by content owners (like DVD movie producers) to prevent illegal copying and distribution of digital media such as video and audio.

Once added CSS copy protection to a DVD, it will prevent byte-for-byte copies of an MPEG (digital video) stream from being playable. Besides, it provides a reason for manufacturers to make their devices compliant with an industry-controlled standard.

CSS Keys

There are three sets of keys associated with the system:

1. Disc Key: Used for decrypting a title key on a DVD;
2. Title Key: Used for scrambling and descrambling DVD data known collectively as a title, which could be a complete motion picture, a trailer, or some similar self-contained unit;
3. Player Key: Used for decrypting a disc key on a DVD; each DVD player manufacturer is allocated one of approximately 400 player keys to incorporate in its players.

The Problem with CSS

It is that the underlying cryptosystem and keys need to remain secret. Even modern cryptosystems are completely open and their workings can be known by anyone. CSS also has a very small number of keys (around 400 only) - another weakness in any cryptosystem. With so many DVD player manufacturers and millions of DVD users, something is bound to go wrong; secrets will leak or someone will crack the system.

How to Remove CSS when Copying DVD

To copy DVD which is protected with CSS, you need to remove the DVD copy protection with DVD ripper software, like WinX DVD Ripper Platinum. It is the No.1 fast DVD ripper that supports decrypting CSS DVD copy protection and copying DVD movie on your computer. What's more, with this DVD ripper, you are also enabled to copy DVD to play on iPhone, iPad, iPod touch, Android phones/tablets, WP8, PSP, and so on.

Guide to remove CSS and other Copy Protection Techs from DVD

Related Software

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WinX DVD Ripper for Mac: Mac version of WinX DVD Ripper Platinum, runs perfectly on Mac OS X Tiger/Leopard/Snow Leopard, convert DVD to MP4, MOV that are playable on Mac computer, as well as iPhone, iPod, iPad, Apple TV, etc.

WinX HD Video Converter Deluxe: Built in hundreds of A/V codecs and equipped with Online Dailymotion/Facebook/YouTube Video Downloader and Photo Slideshow Maker functions. As all-in-one HD Video Converter software, it helps you transcode HD video formats like convert AVCHD M2TS to MKV, convert Blu-ray to MKV, H.265/MKV to MP4, etc. Moreover, it is embedded with numerous profile settings for Apple, Samsung, HTC, Sony, Microsoft portable devices, iOS, Android, Windows mobiles. Convert MKV to iPhone, MKV to iPad are good examples.

WinX HD Video Converter for Mac: Professional HD Video converter for converting HD Videos on Mac OS, provides the perfect solution to convert Blu-ray videos and videos from HDTV and HD camcorders, like JVC, Panasonic, Sony and Cannon to other formats. Also act as a Mac screen and camera video recorder, slideshow maker, Online Dailymotion/Facebook/YouTube video downloader, etc. Running perfectly on Mac OS X Snow Leopard/Lion/Mountain Lion/Mavericks/Yosemite/El Capitan.

Related Source

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Rip Protected DVD on Mac: How to Backup Copy Protected DVD Movies on Mac OS X (El Capitan Included)

Rip Protected DVD to iPhone: How to Rip protected DVD to iPhone 5/6/7 supported video on PC/Mac

Free DVD Ripper Software: How to Rip and convert copy protected DVDs for free

DVD Copy Protection Software: General DVD Copy Protection Software/Technologies | How to Copy a Protected DVD on PC/Mac

Related External Source

CSS - Content Scramble System (CSS) is a digital rights management (DRM) and encryption system employed on almost all commercially produced DVD-Video discs. CSS utilizes a proprietary 40-bit stream cipher algorithm...

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