I use M4V Converter Plus. As we know, movies you purchased from iTunes are M4V with DRM-protection. With M4V Converter, you can convert M4V to MP4. In this way, you can transfer converted files to your non-apple devices. Hope can help you. Have a nice day.
If you want to play an iTunes-purchased video on another non-Apple device, you need to convert it to other common formats. I used M4V Converter Genius to convert iTunes purchased video to my Android tablet, you can have a try!