How to transfer movie from a disk to an ipad or iphone?

I find that there's no point of me purchasing the same movie that i already have on a movie disk for my ipad.

Hi, you can try 4Videosoft iPad Manager Platinum, which will transfer videos, pictures, music, etc from computer to an iPad or iPhone. It's easy to use. You can find it on the website and have a free try. It works great for me.