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This plugin removes the unobtrusive footer text installed by “Ozh Admin Drop Down Menu” in the backend (admin) of wordpress.

Remove Ozh unobstrusive credits in footer

It still works with at least wordpress 4.9.3 version.

Great!

Removes Ozh footer text from the admin backend. Author: Polemos

Guesses your visitor’s Country from his IP. You can then add commenter’s nation flags next to their name in comments, for example.
For documentation and tips, please refer to the official plugin page for <a href="http://planetozh.com/blog/archives/2004/08/27/ip-to-nation-plugin/" title="IP to Nation" rel="nofollow ugc">IP to Nation</a>

Ozh's IP To Nation

Guesses your visitor's Country from his IP

Remove Ozh unobstrusive credits in footer vs Ozh's IP To Nation