[harry8]

>Everyone and I mean everyone knows why mathematica and windows is closed source.

Nope. Neither you, nor I, nor anyone knows why any other person has made a complex decision unless they say, and even then we're assuming they're being honest and sometimes people lie for PR! [1]

I'm of the opinion that anyone turning up to speak at a licensing conference and refusing to talk about the licensing of their own stuff is heroically silly. I mean just wow. Anyone not anticipating being questioned about their licensing in an open question time or who can't handle an "attack" at a percieved disconnect between words and actions about licensing at a licensing conference probably shouldn't be there or indeed out in public. Responding with no substance and a personal slur (which is what is reported here, but I haven't confirmed) is really, really, weak and poor at best.

[1] For example Wolfram's company isn't listed and he can't spend the money he has made, making a very different decision framework for him from the CEO of microsoft, beholdent to the board representing the shareholders. Which was also the framework that made Solaris into OpenSolaris, arguably far too late to preserve SUN wealth. These are difficult and complex decisions that people are very sure of and frequently get very wrong even from a pure wealth-maximisation standpoint.