Convert Overdrive Auidiobook WMA to MP3 for iPad, iPhone(4), iPod touch(4), Droid

An OverDrive WMA Audiobook title is a digitally-protected audiobook that has been optimized for download. Library patrons have to install a Windows program called the OverDrive Media Console that allows them to play borrowed/downloaded content in a DRM-ed Windows Media format. You can play the content as many times are you want during the artificially-enforced lending period, after which the content times out. But The DRM license copy protection on audiobook will restrict users' freedom to play overdrive audiobook onto other incompatible devices like iPad, iPhone(4), iPod touch(4), Motorola Droid(X/2), Walkman, Creative Zen, PSP etc.

For managing OverDrive Audiobook freely, we need to convert DRM-ed Overdrive WMA to open MP3 format. You can simply re-record OverDrive audiobook from your sound card using direct sound recording software. Or you can remove DRM protection from WMA files:
Four ways to remove DRM from WMV and WMA (Windows Media video and audio files)

Please do not abuse rental licenses. DRM removal software is intended to be used as a personal archiving tool only. If you remove DRM protection from an OverDrive audio book file, you should delete it as soon as the DRM license of the corresponding audio book file becomes expired.