They didn't write Silverlight, they're using it. He's saying that when they write an app, they'll release the code if it's a Tech app, but not if it's a movie

They didn't write Silverlight, they're using it. He's saying that when they write an app, they'll release the code if it's a Tech app, but not if it's a movie app. Things they didn't write, like Silverlight, don't come into that equation.