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Dvd With Copy Protection

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Dummy files on CDS

For the most part CD-ROMs use an ISO9660-filesystem to arrange the existing space into files and folders. The majority of times it is used underneath a further sophisticated file system like Joliet to get round a few limitations. The most basic approach is to fake a little information inside the file system. Early production of software copied every file one at a time from the original medium and re-created a new file system on the target medium, losing the faked information, hence making a copy disk un-useable.

Illegal sectors on CDS

The top-level data structure of a CD-Rom is called a sector and it is the only one that is available to software (counting the OS). Every sector contains 2048 byte of user-data and 304 bytes of structural details (for a MODE1 CD-ROM), the sector number, signifying the sector's absolute and relative logical location

Using the Error Detection Code(EDC) and Error Correction Code(ECC) field, the drive can spot and fix read-errors.

Deliberately crafting sectors with improper EDC/ECC fields at some stage in manufacturing provides a distinguishing feature used in copy protection methods. The protection's software tries to read those sectors, awaiting read-errors. Since early versions of end-user software and hardware were not capable of generating sectors with illegal structural details, this characteristic could not be re-generated with such software and hardware. The disc is a copy if the sectors forming the distinguishing attribute have become readable.

With modern machines the above approaches do not give the protection needed, as current software and hardware are capable of reproducing raw sectors.

An adaptation of this approach uses large areas of unreadable sectors with tiny islands of readable ones in between. For the most part software trying to reproduce protected media will miss intervals of sectors once confronted with unreadable ones, expecting them all to be bad.

DVD Protection

DVDs can be protected with a new generation of technology, CSS (Content Scramble System) being the most effective and widely used. CSS is a relatively simple encryption technology. Every DVD is encrypted with a 40-bit key, generated for each movie. At the beginning of the disc, this key is encrypted by numerous keys representing potential keys for your DVD player. When the DVD is place in the DVD player it will scan through its internal keys, trying to match them to the 400+ keys on the disc. The exact method of how this process of protection works in detail is still confidential and protected as to avoid giving code breakers the information they need to crack it.

Dvd With Copy Protection

Content protection system architecture (CPSA) is a basic-level security provided by manufacturers control access to information on DVDs. IBM, Intel, Matsushita, and Toshiba (the famous DVD 4C entity) developed the technology. These companies followed the guidelines provided by the Copy Protection Technical Working Group (CPTWG) to develop encryption, watermarking, protection of analog and digital outputs.

Given below are different levels of Copy protection used DVD companies to safeguard information.

The Analog CPS (used in Macrovision Software)

Macrovision 7.0 prevents basic level analog copying of videotapes. The copy protection is often exhibited in color, distortion, rolling, black & white picture, and dark/light cycling.

Popularly known as Copyguard, this copy protection is present on Computer video cards with composite or s-video (Y/C) output.

Macrovision uses Analog protection to alter the video in two ways:

? Using Color stripe technique

? Modulating the Colorburst signal

As stated above, the protection is extremely basic and is easily overcome by small softwares like DVD Red, Video Clarifier, Image Stabilizer, Color Corrector, DVD Red, and CopyMaster. Modern DVD players can overcome the Macrovision facility with professional time-base correctors (TBCs) installed within them

The SCMS or the CGMS system

The SCMS is a serial copy generation management system that is embedded in an outgoing video signal. The protection prevents the creation of clones and master copies, which can be used to generate more copies.

A CGMS system is available in two formats:

CGMS- A

The analog CGMS protection encrypts data on NTSC line 21. Digital camcorders and video capture cards are able detect the presence and absence of a CGMS-A

CGMS-D

CGMS-D is used to encode information in DTCP and HDMI digital connections. Information is used on the IEEE 1394/FireWire protocol.

Content Scramble System (CSS)

The Content Scramble system is a deeper copy protection used in DVDs. Content Scramble System involves higher-level data encryption and prevents direct copying of video and DVD files. Matsushita and Toshiba created the Content Scramble System to protect the uniqueness of their DVDs.

A CSS algorithm was considered absolute offering 409 probabilities in copy protection. However, the problem ended in October 1999, when a software to overcome the CSS algorithm was posted on the Internet.

Digital Copy Protection System (DCPS)

The Digital Copy protection is the successor of the CSS system. It was used to modify digital connections between components without allowing perfect digital copies. Digital Copy protection are of two types DTCP and HDCP. Both these protections are used in Intel, Sony, Hitachi, Matsushita, and Toshiba DVD discs and Video connections.

All the offered copy protections are optional for the producer of the discs. The hardware versions of copy-protections are not reliable and often error prone, on the other hand, software versions are more restrictive

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About Author

Both Allan Hall & Amanda Hudson are contributors for EditorialToday. The above articles have been edited for relevancy and timeliness. All write-ups, reviews, tips and guides published by EditorialToday.com and its partners or affiliates are for informational purposes only. They should not be used for any legal or any other type of advice. We do not endorse any author, contributor, writer or article posted by our team.

Allan Hall has sinced written about articles on various topics from Computers and The Internet. For we can apply CSS protection during the DVD manufacturing process. View a detailed video on the. Allan Hall's top article generates over 1900 views. to your Favourites.

Amanda Hudson has sinced written about articles on various topics from Computers and The Internet. Amanda a well known computer software reviewer has released this free report on software. Learn from Amanda ho. Amanda Hudson's top article generates over 1900 views. to your Favourites.

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