Movies purchased and Rental from online movie stores, such as Zune Market Place, CinemaNow, Blockbuster, Amazon Video on Demand, BBC iPlayer, etc. are often in WMV and locked by DRM protection to limit your from playing the videos on non-specified devices and players.
If you want to play these WMV Videos on your pc or other protable players like iPhone, iPad, iPod without limitations, you should remove DRM from wmv and convert to unprotected video formats.
Remove DRM from Amazon Video on Demand:
Also, Remove DRM from BBC iPlayer, Zune Marketplace, CinemaNow and more:
http://www.youtube.com/playlist?list=PLm8fdT2NjP9IhmHLywWGBcjDk9_4c245A
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DRM Media Converter
Tired of copy protections that keep you from sharing music and video downloaded or purchased from iTunes, Rhapsody, Amazon Instant Video, BBC iPlayer, Zune Marketplace, etc.? DRM Media Converter lets you legally remove Digital Rights Management (DRM) protection from any audio and video bought from online movies and music stores instantly.
* Strip DRM protection from M4V, WMV and ASF video
* Remove DRM from AA, AAX, M4P, M4B and WMA audio files
* Convert to DRM-free video/audio files in any regular format
* Export Media files for playback on any portable devices
Other Tutorial:
Record Music from Streaming Video, Audio
Download and Convert Online Videos