You want to know what is DVD ripping..??
ripping
>Converting an audio CD from its native CD-DA format to MP3, AAC or some other compressed audio format. When the term was coined, it had a perverse meaning. Many loved the idea they were "ripping off" the music industry by making copyrighted works available in a compact format that could be quickly downloaded over the Internet. Ripping is also called "importing."
>Decrypting a DVD movie and storing it on a hard disk. Ripping a DVD does not result in a smaller, compressed version of the original as it does with audio files.
*www.answers.com/DVD+ripping?nafid=3