[mattynice]

He most certainly did:

In response to: "Perhaps you'll consider releasing it under creative commons 2.0 at some point :)."

He said: "I don't own the rights—the publisher does—but if you're extremely online, you can find a copy in the usual places."

https://twitter.com/Snowden/status/1207628691234316288

[colejohnson66]

That’s not saying you’re free to do so. That’s saying, if you want to, here’s how. There’s a fine line between the two.

In other words: He doesn’t own the rights, so he can’t tell you what you can do with it; Only the publisher can.