Yes. The Go implementation from Google is under the BSD licence. There's also the GNU implementation in GCC that's under the GNU GPL 3 licence. Moreover, the s

Yes. The Go implementation from Google is under the BSD licence. There's also the GNU implementation in GCC that's under the GNU GPL 3 licence. Moreover, the specification itself doesn't seem to have any licencing requirements at all. So you're absolutely right: Go is the very opposite of proprietary.