>Just one problem: while Microsoft itself uses the term ?open sourced?

I think you will find that Microsoft will make its own definition of the word 'open'. for example for years they have been calling their bulk license purchasing plan the 'Open License' (OLP, OLV, OVS, etc). Their Open is not GPL. They want��hobbyists and students to tinker with their products and if you're not making money they wont bother you. for example they give charities and schools dirt cheap pricing because they just want everyone to use their products. Their bottom line is; if you make money off our product we want our cut of that to return to our investors.