Our products are distributed as free 30, 14 or 7-day trial versions.
The trial versions are fully functional; however, they will expire after 30/14/7 days unless it is registered.
If you like a program, you can then purchase it. This will remove the trial limitations and let you use the program as often and as much as you like.
MP3Resizer for Mac uses code of FFmpeg licensed under the LGPLv2.1 and its source can be downloaded here.