In order to prevent unlicensed sharing, iTunes digital files are encrypted by Fairplay DRM technology. But as for iTunes music, they have released from DRM protection from 2009. But if you would like to remove DRM from iTunes purchased music, you can have a try of TunesKit Audio Converter, which can work on Apple music, iTunes music, audiobook, and more.
Maybe you might like to remove DRM from iTunes movies and TV shows for watching them on Android devices.
iTunes M4V Converter seems a smart choice for you to do that, since it can work at both iTunes rentals and purchases at 30X faster speed.