If you want to watch movies from Amazon on any PC or other portable devices like iPad, Samsung, HTC, BlackBerry without limitations, you have to remove DRM from Amazon on Demand protected video files. Watch this video you will see how it works, both purchased or rented movies are supported.
Amazon DRM Removal | How to remove DRM from... by MultimediaToolsMac
To get rid of DRM protection from Amazon Unbox Video, you need a DRM removal which can help you remove the annoying DRM. DRM Media Converter, an easy-to-use yet powerful DRM software that can help you remove Amazon Video on Demand DRM fastly and convert to any popular video/audio formats for you PC and portable devices.