[EMIRELADERO]

Sure, but the weirdness here is that the program is fully free to begin with, for commercial use even.

[Dalewyn]

It's worth remembering that free and open source are two completely separate factors. Something could have restrictive licensing despite being open source, while another could have very free licensing despite being closed source.

Open source by itself simply means the source is readily available for reading, nothing more and nothing less.