iTunes File Formats: AAC Protected .mp4


I have just opened my new HiFiMan 601 DAP in search of higher, portable fidelity.

The player seems to recognize WAV files - my main motivation for abandoning the iPod, as I would like to load up the player with WAV files for critical listening or favorite music for the gym.

However, it does not seem to recognize mp4 files.

I was hoping, for more casual listening and Audiobooks, to also transfer my iTunes library, which although I am still searching several external hard drives, generally seem to be in the format as described above.

Can I convert this file format to WAV or another format which could more easily be read by this player?

Or is this the proprietary format which requires an iPod and iTunes?

Thank you,
cwlondon
Are the protected files all m4p files, or just m4p files that were downloaded from iTunes? If they're iTunes bought files, you can burn them to CD and rip the CD. The convenience of that depends on how many files we're talking about.
Kbarkamian

That sounds like a relatively straightforward solution - thank you.

Generally, they are files (and also audiobooks) that I downloaded from iTunes.

I don't have a huge library, and in the absence of a WAV option, I think I generally used so called "Apple Lossless".

I do want to figure out this puzzle before loading up the new HiFiMan player for a test drive at the gym.

Experimenting tonight using EAC, I notice that WAV files ripped from CDs using EAC are in fact "tagged" easily enough, at least with the track title information.

However, it seems if I copy WAV files as a test to the HiFiMan player, they seem to play back only in alphabetical order.

Therefore, I would have to manually create "playlists", by adding sequential numbers to the beginning of the filenames?

If so, that could almost make me go back to an iPod.

But of course if convenience were my goal, I wouldn't actually be a self respecting "audiophile".
In order to convert iTunes audiobook, you need an DRM audiobook converter to help you strip the DRM protection as well as transform your drm files to common audio files. You can take a look at this link to help you get rid of any limitations. https://www.drmare.com/drm-audio-converter-for-mac/
As for iTunes movies, they are encoded in AAC protected MP4 format or called M4V format. 
As for iTunes music, they are encoded in AAC protected MP3 format or called MP4 format. 
Here, I will share some small tricks of iTunes AAC protected audio files. If you would like to convert iTunes audio files to other unprotected format, like MP3, you can have a try of iTunes DRM Audio Converter for Windows. Hope this software is helpful for you. 
In my opinion, to remove DRM protection from iTunes movies on Windows, you need to crack DRM encrypted in all iTunes movies at first. We all know that iTunes movies can be played on Apple devices only. DRM Media Converter for Windows is the program for me to crack DRM  protection from iTunes purchased and rental movies. After conversion, all these videos are lossless quality. You can enjoy non DRM protected iTunes videos and TV shows on Samsung TV, android phone, Windows PC and other devices freely. Maybe you can check more info on Tuneskit Software. Hope this tip is useful to you.