How to convert DRM protected music and movies to MP4/AVI/MOV/MP3/WMV/AAC...

Many people ask me the same question: "I purchased videos on iTunes, but I can't play them on my video player, because they are in some 'protected' M4V format that only works on iPods. How can I convert iTunes videos to MPEG or WMV format so I can play them on My portable video device such as Archos and Creative Zen?"

I searched on Google, Yahoo answers and post the question on large number of forums, unfortunately, after scouring the Web for days, I couldn't find a FREE way to convert M4V to MPEG, WMV or AVI format.

Then I tried to burn the iTunes video onto a DVD and re-import it into iTunes just like how to remove the protection from the iTunes audios (M4P) by burning it onto a CD and re-import it as mp3. I failed, cause iTunes doesnt have a DVD burning option, then I used Nero, but it still doesnt work as Nero doesnt supports M4V format.

And finally, a software solution. I came across a few kinds of converters on Google search:
DRM removal software