iTunes is an one-stop multimedia entertainment online store for iPhone, iPad and Apple TV users. As to videos, you can buy or rent movies as well as purchase TV shows. You can also get some free music videos if you have an subscription of Apple Music. However, all movies, TV shows and music videos from iTunes store are encrypted M4V format and couldn't be played on unauthorized Apple devices or various non-Apple devices like Android, Kindle Fire or game consoles.
If you want to enjoy your purchased movies and TV shows or downloaded music videos freely, or use as input files in your video editing project or Blu-ray/DVD authoring project, you can use M4V Converter to convert them to all-purpose and plain MP4 videos.
Note: The free trial version of M4V Converter can convert 5 minutes of each protected M4V video on both Windows and Mac OS X. We strongly recommend you download and install the free trial version, have a test before purchasing a license key.