[MLton-user] Is mlton free software?

[Matthew Fluet]

> I have read the license and it seems to me that it has a big flaw. If
> somebody wants to, they can just take MLton code, change it and
> distribute without the source code. They could even change the license
> to a different one. This way the software is non-free (using FSF's
> definition of freedom).

Someone cannot change the license to a different one.  The choice of 
license belongs to the copyright holder(s).