How to convert drm wmv to mp4?

Hi, I'm new here. What I need is to try to help me in finding an easy way to convert my protected wmv to mp4 in order to put them on my iphone. This is a new domain for me, my sister gave me an iphone as a present, so I'm not so familiar with those things, never used an iphone, never used a tool to convert my wmvs to other format, so please, whatever you want to suggest me, be as much explicit as possible.
Thank you very much and any help is appreciated...

I think the best software to convert drm audio and video is MelodyCan)
I use it long time) It's fast and easy converter)) try it)