t0nee1 sounds right on with the info he has supplied. there is however more detailed guides provided at doom9 http://www.doom9.org/index.html?/mpg...ink31-main.htm.

never heard of DeCSS either, did a search on answers.com:

Hacked By a 15-Year Old

The software was engineered through a hacker network known as MoRE (Masters of Reverse Engineering) that obtained some of the CSS code. It was completed by 15-year-old Jon Lech Johansen, a Norwegian student, ostensibly to play DVDs on his Linux machine. However, Johansen released the final version over the Internet in late 1999, causing considerable dismay to the DVD movie industry. Other "DVD ripping" programs, such as DVD Decrypter, were later created by different parties.