We have found 3 software records in our database eligible for .m4a to .m4p file format conversion.
Both .m4a and .m4p are just fine variants of MP4 multimedia files, the difference being that .m4p have digital protection. Several multimedia converters claim to support such m4a to m4p conversion, but if it actually works could not be verified.
Updated: December 23, 2022
A music library management program - renamed to Helium (version 12) and replaced in 2016
M4A
FIles with m4a extension are audio files stored in MPEG-4 (MP4) container and use AAC (Advanced Audio Coding), or Apple Lossless (ALAC) audio compression. M4A is very popular on Mac computers, because it is default audio format used by iTunes. M4A is also default audio format for Apple portable devices (iPod, iPhone, iPad).
M4P
An m4p file extension is associated with the proprietary version of AAC (advanced audio coding) for the MP4 file format with Digital Rights Management developed by Apple, for the use in music files downloaded from their iTunes Music Store.