I know Olm is open: "The Olm specification (this document) is hereby placed in the public domain.", https://matrix.org/docs/spec/olm.html https://matrix.org/doc

I know Olm is open: "The Olm specification (this document) is hereby placed in the public domain.", https://matrix.org/docs/spec/olm.html https://matrix.org/docs/spec/olm.html). Is the Matrix Spec public domain too?