You can have information that is public domain but still secret. Open source falls under copyright; secrecy falls under whatever national security laws are in p

You can have information that is public domain but still secret. Open source falls under copyright; secrecy falls under whatever national security laws are in place. The UK government's cabinet papers fall under this: they won't be released for thirty years, but they will be released under the Open Government License. I'm not sure that this is what the article is advocating, though.