DeCSS will only work with older movies. Beginning in January of this year, many studios began using a different technique for encoding movies. So you will have to use a different DVD ripper. One of the ones that works for 99.9% of movies now, is VobDec. It doesn't contain any "illegal" code within it, unlike DeCSS, since it uses a brute-force attack on the VOB file, trying out all possible combinations. Seems to work quite well. I recommend using one of the GUI rippers that has VobDec built-in, such as CladDVD.