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One of the ways of removing copy protections is to intercept the data stream as it is decrypted out of the protected file, and then use this data to construct a "free" file. These programs (e.g NoteBurner M4V Converter Plus) require a decryption key. These kind of software that do this for iTunes videos, however, rely on the user's own key — that is, they can only process content that the user has legally acquired under his or her own account.
The other method to bypass DRM on audio files is to record protected audio files to plain formats or to burn the content to an audio CD and then rip it into DRM-free files. NoteBurner iTunes Audio Converter and NoteBurner Spotify Music Converter will record playing Apple Music or Spotify in the background at fast speed with lossless quality.