For legal purposes only... (yes there are legal reasons to do this!!). A year ago I would have said Freemake, but since they have gone all crazy with bloat and spyware, and have failed to rip a lot of US DVDs without audio sync issues, it made me look again... and I'm glad I did. This is basically a PC version of Handbrake, and by far the best DVD ripping software out there (and it rips blurays).
VidCoder
http://vidcoder.net/
that is all.