Convert All Popular Audio Formats
DRMBuster - DRMBuster is a powerful all-in-one audio and video conversion software for any kind of purchased or legally obtained music and video.
DRmare Audio Converter - DRmare Audio Converter for Windows is a complete audio DRM removal tool designed to convert both protected audios, including Apple Music, Audible audiobooks, iTunes music, and common audios to MP3, WAC, FLAC, M4A, AAC, etc.
Apprentice Alf's DeDRM Tools - Everything you ever wanted to know about DRM and ebooks, but were afraid to ask.
Easy M4P Converter - Easily remove DRM from iTunes DRM protected files, and batch convert M4P to MP3
AppleMacSoft DRM Converter for Mac - Legal Convert iTunes and Apple Music M4P to MP3 on Mac with DRM Converter 3.
OpenAudible - OpenAudible Project Page