[palata]

> It's not something they "could" do, it's something they MUST do.

Well, maybe I just can't English :-).

They must include the copyright notice and the permission notice. Now I can imagine different ways to achieve that. They could use one or the other, as long as what needs to be included is included.

Depending on how they do it (while staying in the realm of what they MUST do, i.e. include the copyright and permission notices), it gives more or less visibility do Spegel. My point was that linking to Spegel in the README arguably gives more visibility to Spegel than alternatives that they COULD choose. And to make it very very clear: what I consider alternatives that they COULD choose are those that honour the licence.