Jaikoz supports M4a Files, Mp4 Audio Files and M4p Audio Files. Jaikoz will not open mp4 files that contain video, only audio tracks. Jaikoz can open and edit Protected Audio Files, this does not effect the protection mechanism

Jaikoz can safety edit protected files, the only functionality that is not available is the generation of Acoustic Ids for these files because the audio cannot be decoded.

Jaikoz supports writing values to Mp4 fields all the fields within the Metadata View. Other fields within Mp4 are not currently shown within Jaikoz but will be preserved. Note Mp4 does not allow multiple values to be entered for any fields, except for artwork. So if you add multiple values for any field (other than artwork) only the first field will be saved.