Dolby Digital 5.1 Question

I would like to know if you can copy a dvd over to the external hard drive and listen to the movie in Dolby Digital 5.1. I have tried a couple of discs that I know have it but it will only play in analog. I do have an optical audio cable hooked into my Denon btw. Thanks in advance.

Unfortunately 5.1 sound is not currently support for ripped DVD files.