Content Scrambling System, meant to make sure DVD videos could not be copied or played in DVD players that were not manufactured in their respective countries. See Macrovision, Intellectual Property.
I spent thirty Euros on this DVD about the Bush Administration's corruption, and it won't play in the United States -- it must be the CSS.
CSS is a largely written programming language often enbedded right in Hyper Text Markup Language.It is often used to create Video Games,make webpages Dynamic,and Used by kids like me to have fun!Go out there,and on the appstore,buy a CSS,JavaScript,And HTML refernence today!
(I Program all of the ones I just listed)