This python script is a radical attempt to remove all personal information from iTunes M4A audio tracks. All ID3 information will be lost in the process, sadly. You need to figure out a special offset in one of your audio files in a hex editor for this to work. If you are looking for a very simple solution, this is not your script.
If this helps you, please consider tipping to make up for the ridiculous amount of time I lost putting this together: