I suggest either DVDFab or AnyDVD to break encryption on those dvds.
DVDFab is an all in one program, in that it can break encryption and reduce the size of the movie to fit onto a blank single layer dvd. It can also do the actual burning to the blank dvd.
AnyDVD just does the decryption part, but you can use it in conjunction with DVDShrink if you need to take parts of the movie out, or reduce it in size to fit a blank single layer dvd. DVDShrink is free to download and use, so it is not an extra expense.
Both DVDFab and DVDShrink can use a free burning program called ImgBurn, which is highly recommended. To get the version of DVDShrink that can use ImgBurn, look at this page: http://www.videohelp.com/tools/DVD_Shrink and click on the link that says Download DVD Shrink with Imgburn.
You can find DVDFab here: www.dvdfab.com
AnyDVD is here: www.slysoft.com
ImgBurn is here: www.imgburn.com
While DVDFab and AnyDVD are commercial programs, both offer free trials so you can try out the programs and see if they will work properly for you.
If you would prefer to make complete backups, with absolutely no compression, that is possible also. Just decrypt the movie, rip it in its entirety to the hard drive, then burn to a double layer blank dvd. If you do this proces, only use Verbatim brand double layer blank disks.