What's a good Free dvd and blu-ray ripping program?

I have windows 7. I'm looking for a completely free program that will let me rip my dvd and Blu-ray movies so I can put them onto my network attached storage? What's a good program for me to use. I heard you can do it with vlc player but does that program degrade sound or video quality? I'd rather have larger files than lower quality.

Thanks.