and what's the problem with this? License the software as-is and with no re-distribution rights, but grant rights to modify and extend the software as you see f

and what's the problem with this? License the software as-is and with no re-distribution rights, but grant rights to modify and extend the software as you see fit. If you want to sell your modifications, so be it, but you can't sell the original software, just your mods. The same way as software developers don't have the right to give away Windows software with our code, we just have the right to sell our enhancements... so in effect (if you remove all the semantics and legal claptrap), we do have the right to modify the software that Microsoft is selling, otherwise hundreds of thousands of software engineers would be out of a job.