Overview and Cryptanalysis of the DVD Contents Scrambling System and DeCSS
This paper presents an overview of DVD's Contents Scrambling System. The purpose of this overview is to then construct an attack tree  of the attacks used, which could be used for developing a tool to test other proprietary (unknown) encryption algorithms. The CSS was put in place to prevent DVD disks made for one region of the world being played in another region. It also prevented copying of DVD content, whether legal or illegal, from the DVD to any other media. It also prevented (due to the non-disclosure of the algorithm to the public) viewing of movies and other content on the DVD Disks on software or hardware DVD players not approved by the Copy Control Association (CCA).