# Mp4 Copyright information not displaying in Windows File Explorer

**URL:** https://community.mp3tag.de/t/mp4-copyright-information-not-displaying-in-windows-file-explorer/54909
**Category:** Support
**Created:** [October 28, 2021, 5:20pm UTC](https://community.mp3tag.de/t/mp4-copyright-information-not-displaying-in-windows-file-explorer/54909 "2021-10-28T17:20:48Z")
**Posts on this page:** 1
**Showing post:** 8

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### Author: ![phw](https://community.mp3tag.de/user_avatar/community.mp3tag.de/phw/32/11831_2.png) [@phw](https://community.mp3tag.de/u/phw)
#### Post date: [October 28, 2021, 9:38pm UTC](https://community.mp3tag.de/t/mp4-copyright-information-not-displaying-in-windows-file-explorer/54909/8 "2021-10-28T21:38:02Z")

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I gave this a small test with an MP4 file on Windows and trying different known MP4 atoms that could hold copyright information. The `cprt` atom Mp3Tag is writing is not read by Explorer. There is also an alternative `©cpy` atom supported by some tools, but that's also not read by Explorer either. The iTunes Metadata Specifications also mention an atom `©cak` for "Copyright  
Acknowledgement(s)" (whatever this exactly means), but this again is also not read by Explorer.

Out of fun I also tried it with `----:com.apple.iTunes:Copyright` (which is the most widely used structure for free text tags in MP4), with different casing of "Copyright", but as expected without luck.

If Microsoft supports copyright information in MP4 it is nothing obvious.

This is also an interesting thread for MP4 tag support in general:

> [@MP4-Felder (Atom/Box) in anderer Software](https://community.mp3tag.de/t/mp4-felder-atom-box-in-anderer-software/48614):
>
> Ich habe mal geguckt, welche [QuickTime/MP4-Metadaten-Atoms/-Boxes](http://mp4ra.org/#/userdata) andere Programme laut ihrer Doku unterstützen und sie mit Mp3tag verglichen. Möglicherweise macht es Sinn, das eine oder andere auf eine Variable und damit ggf. auch auf ein ID3-Feld zu mappen sowie ggf. die Werte aus seltener verwendeten Atoms in semantisch äquivalente zu kopieren. FFmpeg Für FFmpeg habe ich keine offizielle Doku gefunden, aber das [Multimedia.cx-Wiki](https://wiki.multimedia.cx/index.php/FFmpeg_Metadata#QuickTime.2FMOV.2FMP4.2FM4A.2Fet_al.) wird öfter erwähnt. Sie scheint nicht ganz aktuell und vielle…

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