Among the numerous DVD rippers existing nowadays in the web, SmartRipper is one of the options.
This small but excellent application, apart from working as a DVD player, makes it possible to extract the data inside any DVD to be stored in your PC.
It has a very practical interface, full of playing, extraction and general setup options.
With this free and public use utility it is possible to make backups from any DVD to your PC in a simple, fast and efficient way.
All in all, if you are forced to store your DVD to keep them protected and untouched, SmartRipper is the most convenient and complete application.