# M4A tags not seen by MP3TAG

**URL:** https://community.mp3tag.de/t/m4a-tags-not-seen-by-mp3tag/17286
**Category:** Support
**Created:** [October 7, 2015, 11:39pm UTC](https://community.mp3tag.de/t/m4a-tags-not-seen-by-mp3tag/17286 "2015-10-07T23:39:32Z")
**Posts on this page:** 1
**Showing post:** 11

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### Author: ![ohrenkino](https://community.mp3tag.de/user_avatar/community.mp3tag.de/ohrenkino/32/4843_2.png) [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [October 9, 2015, 4:25am UTC](https://community.mp3tag.de/t/m4a-tags-not-seen-by-mp3tag/17286/11 "2015-10-09T04:25:58Z")

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> [@poster](#):
>
> What do you call "private fields"?  
> Is there a difference between a "private" field and a self defined field?  
> As we all know self defined tag fields can be created in Mp3Tag and they are not ignored.

Private fields are fields that in a way are user-defined fields but there is no common standard to access their contents. Some of them are used to transport DRM.  
MP3tag ignores these and does not even tell you that they are there.

For further information you may have a look at  
[http://id3.org/id3v2.3.0](http://id3.org/id3v2.3.0)

Section 28: Private Frame [http://id3.org/id3v2.3.0#Private\_frame](http://id3.org/id3v2.3.0#Private_frame)

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