Technical Approach
Functionally, the purpose of QTFairUse is to convert protected audio files (.m4p extension) purchased from Apple's iTunes Store into M4a files, without DRM. To accomplish this task it uses a rather uncommon approach: instead of removing the already present DRM, it waits for iTunes to play back the protected file and intercepts the unencrypted AAC data stream as it is sent to the sound card. During this process, it copies unencrypted data, frame-by-frame, into RAM and then inserts it into a new MP4 container that is free of any DRM.
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