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.

eugenealegiojo

The plugin that will let admin user to add download links to any posts/pages in simplest way and hassle free. 
Allows all your site visitors to download any files from your website without any user restriction.
<h4>Features</h4>
<ul>
<li>Downloader button is available in your admin content editor for post, page or post type. Shortcode will be generated automatically.</li>
<li>Insert download links manually via shortcode [media-downloader] to any posts, pages or custom post types. Check for more parameters below (Embedding).</li>
<li>Allow users to directly download in all file formats for free.</li>
<li>No file size limit for downloads. 
For more information please check the <a href="http://phplugins.softanalyzer.com/simple-file-downloader/" rel="nofollow ugc">Simple File Downloader</a> documentation page</li>
</ul>
<h4>Embedding / generated Shortcodes</h4>
Create a new post/page and click the ‘Add Download’ button from the content editor, then generate the shortcode below:
<pre><code>[media-downloader media_id="9" texts="Download Now!"]
</code></pre>
Media id is automatically added from your media library.
Here are the all the available parameters when generating shortcode for file download:
texts
If you choose to leave the texts parameter empty, then it be defaulted to ‘Download File’.
image_url
You can also use image/button as your download link. If you supplied this parameter, then texts parameter will be replaced by this image.
<pre><code>[media-downloader media_id="9" image_url="http://domain.com/wp-content/themes/images/button.png"]
</code></pre>
class
You can add class to your download link either a texts or image button. This is useful if you want to apply your own style.
<pre><code>[media-downloader media_id="9" texts="Download PDF" class="download-pdf"]
</code></pre>
display_filesize
You also have an option to display the size of the file. Just set it to ‘yes’
<pre><code>[media-downloader media_id="9" texts="Download PDF" display_filesize="yes"]
</code></pre>

Simple File Downloader

Simplest way to add download links into your posts/pages.

Media Vault vs Simple File Downloader