According to the changelog, Monkey's Audio is licensed under 3-clause BSD starting with version 10.18, released the 10th August of 2023. This is the same kind of license FLAC and WavPack use.
Version 10.18 (August 10, 2023)
- Changed: Switched to the three clause BSD license to simplify inclusion of the source code.
- Changed: Renamed some macros from MAC_ to APE_ since APE is a little more widely used now.
- Changed: Updated to Visual Studio 17.7.0 (fixed code analysis warning about directories in the last builds).
- Changed: Updated the installer to NSIS 3.09.
- Changed: Updated to version 2.80 of the ALAC tool.