Convert your movies on your PC using the free programme called Format Factory to avi format. And then side load to the iPad using VLC as the player. That's what i do and it is easy and works and the films don't take up too much space on the iPad.
Try videora. It is what i use. I don't think it ha viruses but it's free so make sure your virus scanner is up to date. I have been using it for years and never recieved a warning from AVG.
I use anyDvd to clear the copywrite and then use handbrake. There is a ipad preset for the files which makes it easy to make sure the file is correct type and resolution.
Just did 5 of my dvds last night , took about 35 minutes per using my laptop. Each movie is about 750-800mb. You can greatly reduce the size by adjusting quality like framerate and such. I just did the preset settings.