There are a wide variety of rippers. I THINK FREEMAKE can rip dvd's. I know it can convert between the various formats. Obviously, ripping high definition, high quality results in larger file size. Some folks want the best quality. Others want a more reasonable file size. Also, it might depend on whether you want to watch only on a tablet or use hdmi (or screen mirror) to show it on a large screen tv.
Whoops, I see the topic may be off limits. I believe there are jurisdictions where you may copy your dvd. And actually, I have ripped dvd's that I have created from Travel pictures that I did burn to dvd using Magix software. Then suddenly found that I wanted them on my BB Playbook and my Z10 and now have moved some of them to the Tab S.
Makemkv is the best as far as creating 1:1 copy into a single mkv file without the menus and previews. Handbrake is best for encoding to the format you need. Many presets etc, while maintaining the best available quality.
I second MakeMKV+Handbrake. MakeMKV does the decryption job and Handbrake can transcoding to MP4 for tablet.
Some freeware are quite good if you only got DVDs to rip like Free DVDAid. You can find the download on CNET.