Ben Horowitz on why you can't ban open source: "You can't actually ban open source, of course. It's out there. It's a file. It's on the internet. We have no way of doing that." "It reminds me of years ago when I was at Netscape, they tried to ban cryptography. The math is out there. You're not gonna ban it. It's not actually possible. But you can prevent the good guys from using it." "That's what would happen in the case of an open source ban. The threats would be, well, you can't work with…