Will ripping a DVD ruin the DVD?

No, While ripping DVD's is a common activity performed by many software programs, even many advanced computer users don't know how to rip a DVD. Ripping DVDs (geek-speak for copying onto your PC's hard-drive) is good for making a backup of their content, or watching them on your PC , iPod, iphone, Zune etc.

No, ripping DVD is just remove the copyright protection of the DVD. It will not harm the content of the DVD.

Often, DVD Ripper software can convert the DVD to popular video formats while ripping the DVD(for example: Daniusoft DVD ripper), therefore you can watch your video on your iPod, iphone, Mac machine.