Philipp15b

This plugin allows you to add your code/text to the headers and footers on all the blogs in the blog network and in the backend of all blogs too.
In addition, it is possible to replace the footer bar text in the backend completely.
You can access the settings under Network Admin -> Settings.

Sitewide (Admin) Header/Footer

Change the header/footer of the front- and backend of WordPress Multisite

Freemius

Smart Protect offers a solution to protect your entire site and choose which pages within your site will not be protected, all in a simple and easy way.
<h4>Features</h4>
1.- Set password for sitewide 
2.- Set page you dont want protect with password

Smart Protect

Smart Protect offers a solution to protect your entire site and choose which pages within your site will not be protected, all in a simple and easy wa …

Sitewide (Admin) Header/Footer vs Smart Protect