[bug#61950] [PATCH] lint: Add 'copyleft' checker.

[Leo Famulari]

On Mon, Mar 06, 2023 at 04:53:40PM +0100, Ludovic Courtès wrote:
>   2. It’s tempting to view devise a “licensing calculus” of sorts and
>      automate assessments of licensing compatibility.  However, I think
>      it’s overestimating both law and our own licensing annotations: how
>      law applies in a specific case isn’t entirely clear until one goes
>      to court, and our ‘license’ fields fail to represent all the
>      relevant nuances anyway (subcomponents having different licenses,
>      dual/multiple licensing, etc.).

I emphasize this point. We should not overestimate our understanding of
free / open-source software licensing. The territory is uncharted and
largely untested in the courts.