DeCSS

A fragment of the DeCSS code, which can be used by a computer to circumvent a DVD's copy protection.

DeCSS is one of the first free computer programs capable of decrypting commercially produced DVD-Video discs. Before the release of DeCSS, free and open source operating systems (such as BSD and Linux) could not play encrypted video DVDs.

DeCSS's development was done without a license from the DVD Copy Control Association (CCA), the organization responsible for the Content Scramble System (CSS) used to protect commercial DVD discs. The release of DeCSS resulted in a Norwegian criminal trial and subsequent acquittal of one of the authors of DeCSS. DVD CCA launched numerous lawsuits in the United States in an effort to stop the distribution of the software.

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