[dotnwat]

What does "k4 is proprietary" mean? Does that mean one way run into problems building an open-source implementation of the language itself?

[maximus-decimus]

It's written by a private company with no public docs and no public implementation. Hell, it's not even directly sold, since it's just used as the backend for Q.

I have heard of people getting into legal problems for making a Q clone but not for k3/k6 implementations, so I don't know where they draw the line there.

[opencl]

There are some a few public docs.

https://estradajke.github.io/k9-simples/

https://code.kx.com/q/learn/