Remove bypass DRM from license protected video music files and Convert DRM Protected Music Video files WMA WMV M4P M4V M4A 

   Most of the protected video and music downloaded online like Windows Media Player iTunes, Rhapsody, Napster, Bearshare , Spiral Frog are all DRM files. 

   What is DRM? Why do we bypass DRM from WMA, M4P, WMV, M4V, M4A, etc? 

  DRM (Digital Rights Management) - The anti consumer copy protection that prevents you from using music or movies in a way that suits you.
  For example, if a DRM WMA or DRM WMV you downloaded from WMP(windows media player) that has windows DRM, you can only play it back on a compatible device, so if every piece of music had windows DRM on it you would need to buy the same track on CD to listen in your CD player or car, as an iTunes download to play on your iPod, as a ms store download to play on your Zune etc, but since you paid for it once you shouldn't be forced to pay for it again and again, remove windows DRM and you can play it on your phone, iPod, Zune, PSP, CD player, pc, and anything else that you can listen to music on.

I got a few methods listed below:
1. Burn and rip
Actually, there is a common free method to remove drm WMA, M4P with 2 steps:
   Step 1 Burn the DRM WMA, M4P to a CD.
   Step 2 Rip the DRM WMA, M4P from CD to your computer as MP3 format , then the DRM should be removed from the WMA files.
   But it's not very convenient that may wear out your CR-ROM, and It also needs a blank CD, a CD burner and a CD ripper to help you.


2. Re-record 
   One of the most common and simple technology is recording the DRM WMA and DRM WMV then use an ordinary converter to convert the recorded and unprotected files. Because this technology is easy to realized and easy to support more DRM formats besides DRM WMA and DRM WMV it is welcomed by most of the DRM converters like the SoundTaxi,Tunebite, etc.
   But there are some disadvantages for those programs.
   1. The conversion speed won't get much improvement due to the long recording process.
   2. Much audio and video quality could be lost during the recording process.


3. Hook 
   Hook is another new and more complicated technology which can be used to remove Windows DRM. Comparing with Re-recording software, these sorts of programs have much higher conversion speed, but it's hard to make it support some DRM formats with new and lofty encryption techniques.
   And as far as I know, Daniusoft was one of its supporters. After giving a test for some free trials I found it's very easy to remove drm from WMV WMA and other protected music video files with Daniusoft Media Converter Pro, it can remove drm protection legally and convert other video & music even HD video in high quality. and here are the key functions of Daniusoft Media Converter Pro

   1.DRM remover
   Legally remove drm WMV/WMA/M4P/M4V/ASF... using record technically process which records play and saves the recordings in unprotected digital formats

   2.Video Converter
   Convert all popular video: MP4, MPG, MPEG, 3GP, RM, RMVB, DAT, MOV, FLV, AVI, Xvid, VOB, MKV

   3. HD video Converter
   Support convert high-definition video: M2TS, TP, TRP, TS, AVI

   4. Audio Converter
   Convert any audio files between MP3, WAV, M4A, WMA, OGG, AAC, APE…

   You can free download the DRM Remover to have a try:



Simple steps for conversion:
1. Add DRM WMV , DRM WMA, iTunes M4P and other protected files.
2. Choose the output format you need
3. Pressthe "Start" button.



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Source:  http://www.daniusoft.org/xsupport/rmove-drm-from-protected-video-music.html