Max GJ Panas

<h4>Protected Attachment Files</h4>
Media Vault cordons off a section of your WordPress uploads folder and secures it, protecting all files within by passing requests for them through a powerful, flexible and completely customizable set of permission checks.
After activating the plugin, to protect attachment files with Media Vault you can:
<ul>
<li>use the Media Uploader admin page to upload new protected attachments,</li>
<li>use the Media Vault metabox to toggle file protection on the ‘Edit Media’ admin page,</li>
<li>use the the Media Vault Protection Settings fields in the new Media Modal, or, </li>
<li>using bulk actions in your Media Library page, you can change file protection on multiple pre-existing attachments at once.</li>
</ul>
By default the only permission check that the plugin does on media files is that the user requesting them be logged in. You can change this default behavior from the ‘Media Settings’ page in the ‘Settings’ menu of the WordPress Admin. You can also change the restrictions set on attachments on an individual basis by means of either the Media Vault metabox on the ‘Edit Media’ page or the Media Vault Protection Settings fields in the new Media Modal.
You can also write your own custom restrictions using the <code>mgjp_mv_add_permission()</code> function. See <a href="https://wordpress.org/support/topic/restrict-only-for-subscribers?replies=5" rel="ugc">this support question</a> for more details.
<h4>Safe Download Links</h4>
Creating a cross-browser compatible download link for a file is a harder task than might be expected. Media Vault handles this for you, and it does so while preserving all the file security features discussed earlier like blocking downloads to people who should not have access to the file.
The download links are available through a simple shortcode that you can use in your post/page editor screen:
<pre><code>[mv_dl_links ids="1,2,3"]
</code></pre>
where ‘ids’ are the comma separated list of attachment ids you would like to make available for download in the list.
Note: Plugin comes with styles ready for WordPress 3.8+!
Note: Now supports WordPress MultiSite!

Media Vault

Found it while looking for restriction view access - it's just what I needed, thanks a lot!



Very useful

Protect attachment files from direct access using powerful and flexible restrictions. Offer safe download links for any file in your uploads folder.

Fabian

Traffic Limiter is a useful addon for blogs with many media files which can cause high data traffic. 
There are three traffic limits to avoid over traffic costs: daily, weekly and monthly limit. If one of these limits is exceeded downloads will either be redirected to a custom URL or a custom message is displayed. For images you can define a fallback icon which is displayed instead of the message. Additionally a download bandwidth can be set for registered users and guests.
Also included is a statistic system which displays the current traffic consumption and individual file stats to see which media produces the most traffic.
All files are sent to the browser by a PHP script, supporting the most HTTP headers like <code>If-Modified-Since</code> (for caching) and <code>Range</code> (for partial downloads)
If the Apache extension <code>mod_rewrite</code> is installed download links stay the same, if not links to media files are automatically redirected. It is recommended to install <code>mod_rewrite</code>, although this plugin works without this extension.
Note: If you provide lots of downloads or media files you should try my download manager <a href="https://wordpress.org/extend/plugins/wp-filebase/" title="WP-Filebase" rel="ugc">WP-Filebase</a>.

Traffic Limiter

Limits traffic and download bandwidth of media files. Additionally this plugin includes a download statistic system.

Media Vault vs Traffic Limiter