they also have CCS protection on DVDs
CCS Digital Copy Protection
The Content Scrambling System (CSS) is used to scramble the audio/ video data on a DVD-Video disc. Each video title set (VTS) can be selectively scrambled using a unique key. Each unique title is assigned one Disc Key and up to 99 Title Keys (one per VTS), which are stored on the disc in encrypted form. In the decoder, the original keys are obtained by decryption and used to descramble the data. Only the video data is encrypted. For DVD-ROM drives, the MPEG-2 decoder challenges the drive and receives the necessary keys for decryption. This ensures that only approved hardware/software can be used.
The keys used should be unique for every disc title and are encrypted by the CSS Licensing Authority and, usually, the scrambling is carried out during glass mastering. Security is vital and the keys used plus the encryption algorithms must be kept secret. Only those companies involved in designing hardware and software for CSS encoding and/or decoding need information on the algorithms and systems used.
they also have regional settings :-
DVD Region Coding
DVD-Video discs that are CSS copy protected can also be region coded to prevent e.g, a US disc playing on a European player and vice versa. This allows titles to be distributed in different parts of the world at different times. A total of six regions (or locales as they are called) have been defined to cover all countries.
Region 1
USA, Canada
Region 2
Europe, Middle East, South Africa, Japan
Region 3
Southeast Asia, Taiwan
Region 4
Central America, S. America, Australia, NZ
Region 5
Russia, Africa, India, Pakistan
Region 6
China
most DVD tools can bypass these... and region codes are bypassed with hacking the firmware of a computer DVD drive/software when duplicating and with key code entry for home standalone DVD players !