I don't do much dvd ripping anymore, but when I did I used Magic DVD Ripper
it worked perfectly. However the software isn't cheap, there are other options out there for ripping DVDs. Just google dvd rippers
and be amazed at the choices. When using any ripper be sure to check that the file output that it creates is compatible with the device you plan to put it on. Android is simple, just download one of the many video player apps from the Google Play Store.
Then it doesn't matter what output the ripper makes the file. I use MX Player
currently but have used MoboPlayer.
Now for using Digital Copies there are lots of ways of putting them on the SGS4G. For simplicity I won't go into much detail, but Digital Copies normally are copy protected. Meaning that they won't usually let you put them on any device and have them work. What I do with all digital copies is just convert them to another format using Quick Media Converter.
Its free and can convert to almost any known video or audio format. If the protection on the Digital Copy is preventing you from converting it you might need a program to remove the encryption from the Digital Copy.. I don't want to get into all that though.. Google
is your best friend