mediawiki how to display information on the login page on a otherwise private wiki

Question

I have setup a private wiki with mediawiki and i'm using a Logo under the CC license so I have to cite the source and the license.

Since my wiki is private and requires a login I need to find a way to display information on the login page and/or about page.

Question 1: Is there a way to display specific pages without being logged in?

Question 2: If not, is there a way to add a global footer that is visible without being logged in ?

Additional info:

I suppose I want the opposite asked in this question:

Answer 1

You need to add this page to $wgWhitelistRead as shown in manual.