Step 1: Launch Prof. DRM to enter into iTunes DRM Remover

As the name suggests, you need to select iTunes DRM Remover if you want to convert the iTunes audiobooks. In case you want to convert Amazon Audible Audiobooks in AAA/AAX to MP3 format, you need to Select Audible DRM Remover.

Step 2: Add M4B Audiobook to the Program

After choosing the iTunes DRM Remover, the following interface will show up to you. Click the "Add Files" button and then tap fresh button on the title of “Audio Books” on the left sidebar to add the iTunes M4B Audiobooks to the software. It allows you to add several files at a time. Or you can directly drag and drop the target iTunes Audible audiobook files to the middle of program interface. (The "Clear" button can also be used to remove the added files.)

Step 3: Choose Channel, Sample Rate and Bit Rate

After importing the desired audiobooks, all the imported files can be showed under the category “Audio Book” . And then you can choose an audiobook file and click the edit-like button to freely choose Channels, Sample rates and Bit rates for keeping in the output MP3 audio file.

Step 4: Set an output directory for output files

At the bottom of the interface, click “…” button to set an output directory for saving output MP3 file.

Step 5: Bypass DRM Protection from iTunes Audiobook and Convert M4B to MP3

After you finish all settings, click the blue “Convert” button at the bottom for removing DRM from iTunes M4B and then converting to DRM-free MP3. In general, the iTunes DRM removal and conversion process will be completed shortly.

Step 6: Check the Converted Files

When the converting process comes to an end, you can click the "Converted" button to view all the converted MP3 files on the panel. Afterwards, you can click "Open file" button to open the converted MP3 file. Or you can directly input the file’s name through the quick searching bar at the bottom of the interface to fast locate the file.