Audible, a subsidiary of Amazon, is an Internet provider of spoken audio entertainment, information, and educational programming, and now enjoys a near-monopoly in the online digital download market for audiobooks.
Audio books purchased from Audible are in .aa format with DRM copy protection which prevents users from playing the AA files on non-Audible Ready compatible players like Creative Zen, Zune, PSP, Sony Walkman, Blackberry, etc. If you want to listen to Audible AA files on any popular portable media player, you need to remove DRM from Audible AA and convert AA to MP3.
With Video Converter Ultimate, you can make the work as easy as a pie! With it, you can easily remove DRM from Audible audiobook and convert Audible's DRM'd AA to non-protected MP3 files for any device in batch conversion mode. After the conversion, you can even directly transfer the converted MP3 files to portable devices. Besides, this DRM converter also integrates the function of Video Converter, DVD Ripper, DVD Burner, Video Downloader, etc. Get it now and read the following guide to convert AA to DRM-free MP3 step by step.
Load AA files by clicking 'Add Files' button on upper left of this smart DRM converter and choose the .aa files you have downloaded using the Audible Download Manage to your computer.

Choose from "Common Audio" optional box, select MP3 or other audio formats you like as the output audio format. Meanwhile click "Browse" button and choose a folder to save the converted files.

The process will begin with your clicking on 'Start' button. After the conversion finishes, you can connect your device to computer and click "Copy to Device" to transfer the converted AA files to proper devices directly.