Prevent my Non-Techie Wordpress Users from Hotlinking

I have a customer website with around 50 authors creating content for the site every day.  Some of these authors are less technical and keep hotlinking to images on other websites.  Does anyone know if there is a plugin for Wordpress that disables the insert image from another url feature?  

To be clear, I don't have others linking to my images.  I have non-technical users who are creating <img src="xxxx"> tags that link xxxx to some other websites image
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jer2eydevil88Asked:
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andy_adamsConnect With a Mentor Commented:
The easiest way would be to add your own plugin, with a single file. The contents of the file would look like this:

<?php
/*
Plugin Name: Prevent Image Hotlinks
Plugin URI: #
Description:
Author: jer2eydevil88
Version: 0.1
Author URI: #
*/

function my_filter_media_view_strings( $strings ) {
    unset( $strings['insertFromUrlTitle'] );

    return $strings;
}

add_filter( 'media_view_strings', 'my_filter_media_view_strings' );

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You could upload this file to your wp-content/plugins/ directory, or ZIP it up and install it using the built-in installer. Let me know if that does it!
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andy_adamsCommented:
I don't know of a plugin that does this, but if you're comfortable adding your own filters, you can do something like the following (assuming you're on WP 3.5):

function my_filter_media_view_strings( $strings ) {
    unset( $strings['insertFromUrlTitle'] );

    return $strings;
}

add_filter( 'media_view_strings', 'my_filter_media_view_strings' );

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This will remove the option from the media overlay. Let me know if you hit any issues!
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jer2eydevil88Author Commented:
What file would I edit in WP 3.5 to put this modified code?
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jer2eydevil88Author Commented:
Needed the closing ?> for the PHP tag.  I went ahead and put it into a folder and zipped it so others can use this.  

https://syntress.com/?attachment_id=29379011
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