2009/3/13 Erik Moeller erik@wikimedia.org:
The point of the provision is to ensure that attribution by link always happens by linking to a copy that actually gives authorship information.
It is vitally important that that be the case, otherwise you could have two mirrors each linking to each other with neither listing the authors, which is not "attribution" is any meaningful sense of the word. I don't under Jussi-Ville's objections - there must be a misunderstand somewhere.