Content Srambling System

Content Scramble System (CSS) is an encryption system used on some DVDs. It uses a weak, proprietary 40-bit encryption stream cipher algorithm. The system was introduced circa 1996.. The CSS key sets are licensed to manufacturers who incorporate them into products such as DVD drives, DVD players and DVD movie releases. Most DVD players are equipped with a CSS Decryption module. CSS key is a collective term for authentication key, disc key, player key, title key, second disk key set, and/or encrypted key.