That said and so, the only real impact PJ's stated prohibition would have is to prevent an outside of GL index to GL being used to reference GL.  The copyright notice is probably adequately blocks an index in and of itself, but there's no way to enforce it if it isn't used.  Her prohibition is a warning shot that she will take legal action against such an outside index which is used to reference GL material.

Possibly a certain amount of paranoia at work there, as those who discussed the possibility of an outside index recognised immadiately that the license change made it unlawful, and NOBODY I know or have heard of had any plan or intent to carry through such without her approval anyway.

I think somebody cited a PJ comment somewhere that PJ said as much herself - that the prohibition was only there to prevent an external index, not to keep people from posting a link to a particular comment or thread for discussion.

Here is a wired article on it: