Dual layer is single sided, but has two dye layers where the information is burned. They are also known as DVD9. Disks that are flipped to burn the other side are DVD10, sometimes called “flippers” and are relatively rare.
If you want to use one program to decrypt, rip and compress the movie to fit onto a single layer dvd, you should look at DVDFab Platinum or DVDFab Gold. Neither are free, but both are still being updated to deal with new protection schemes. DVDShrink can do all these things, but development stopped almost 4 yrs ago on it, and it will no longer decrypt many newer dvds.
There are other options, but they are not all-in-one. The whole process can be done with free tools though, if you are willing to use different programs for each step.