As for me, the most important is about how to convert DRM protected videos/audios to common format. Since all iTunes videos/audios are combined with fairplay DRM protection, it can be played on Apple devices only. Even you have paid for it, there is no right for you to re-encode or share it to other devices. Now with using DRM removal software like iTunes DRM Media Converter to remove DRM protection and convert videos from M4V to MP4 and multiple compatible formats. As for audios, you can check more info on here. Hope this tip is useful to you.