To back up a DVD video, download "DVD SHRINK". Google search "DVD shrink free download" and you will get a download page .
DVD SHRINK GUIDE:
 Run DVD Shrink
 Insert the encrypted DVD into your DVD drive
 Go back to DVD Shrink. Click on the "Open Disc" button at the top-left hand corner of the program.
 Select the DVD drive in which your DVD is inserted. Usually the "D:" or "E:" drive. (The drive with the disc inserted will have a title)
It Is now "opening" the disc (decrypting the disc)
Once that is done, click on the folder "Main Movie" and select whatever file is in there to play.
Now hit the "Backup!" button at the top of the screen.
Hit the OK button. It is now re-encoding the movie.
I am using the movie "Hitchhiker's Guide to The Galaxy" , so it would be saved under the directory C://HGGOEUW1/
You can then watch that movie from your hard drive by hitting the "Open Files" button at the top of the screen.
Enjoy your DVD