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This page was revised August 2010
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How DVDs are encrypted to prevent copying:
.... CSS was developed primarily by Matsushita and Toshiba. In October 1999, the CSS algorithm was cracked and posted on the Internet, triggering endless controversies and legal battles
Not much has changed since that time as the manufacturers of DVD players and the producers of DVDs have to maintain compatibility with the vast amount of material released. Changing and adding to this encryption scheme would render a lot of current titles unplayable.
The "industry" had its hopes set on Blu-Ray Disks solving this problem for them. However, this has not proven to be the case as there is a vast amount of DVD product available and consumers are largely satisfied with the quality.
..... Shortly after the appearance of DeCSS, the DVD CCA filed a lawsuit and requested a temporary injunction in an attempt to prevent Web sites from posting (or even linking to!) DeCSS information.
DVD43 is a Windows executable that uses the techniques developed for DeCSS - CSS has become the defacto standard for DVD encryption - Nothing much has changed and BD (using a different encryption method) has had little impact on this. The major impact on the thwarting of CSS circumvention is the advent of Windows 64 bit versions rendering DVD43 inoperable.