iTunes purchased movies are protected by DRM. So you can't play the drm videos on other devices unless you can remove the drm
In fact, you can find there are many programs that can do it. I heard a well reviewed program Adoreshare M4V Converter Genius. It is said this program can convert DRM-Protected iTunes M4V Videos to Any Format to Play Anywhere. I have tried this program. It is powerful.
First, you can convert m4v videos to other formats without quality loss. In addition, this program applies new technology. It can convert videos with 30x speed
Second, besides converting videos, you can edit the videos during the conversion like Rename, Trim, Crop, Play, Volume, Remove Merge, Change, Aspect, Ratio And More