Content Scrambling System (CSS) protection

Content Scrambling System (CSS) is a data encryption and authentication method used to protect digital versatile disk (DVD) movies from being illegally copied, distributed, and viewed from other devices, such as computer hard drives. CSS is one of several copy-protection methods currently used in today's DVDs.

The CSS method was developed by members of the DVD Copy Control Association. This association includes companies in the U.S. motion picture industry and the consumer electronics industry.