Yes. Everything is published under Creative Commons Attribution.
(One of the members of our steering committee, Michael Nielsen, has a significant history advocating for open science. I think there's about a snowball's chance in hell he'd be involved if we weren't. :P )
> Diagrams and text are licensed under Creative Commons Attribution CC-BY 2.0, unless noted otherwise, with the source available on GitHub. The figures that have been reused from other sources don’t fall under this license and can be recognized by a note in their caption: “Figure from …”.
Ideally code and data would be unambiguously public domain (CC0-1.0) or under appropriate open source and open data licenses.
(One of the members of our steering committee, Michael Nielsen, has a significant history advocating for open science. I think there's about a snowball's chance in hell he'd be involved if we weren't. :P )