> Permission is hereby granted to use the Program free of charge for any noncommercial purpose, including teaching and research at universities, colleges and other educational institutions, research at non-profit research institutions, and personal non-profit purposes. For using the Program for commercial purposes, including but not restricted to consulting activities, design of commercial hardware or software networking products, and a commercial entity participating in research projects, you have to contact the Author for an appropriate license
The Free Software Definition says this:
> a free program must be available for commercial use, commercial development, and commercial distribution
The Open Source Definition says this:
> The license must not restrict anyone from making use of the program in a specific field of endeavor. For example, it may not restrict the program from being used in a business
