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    <p>You can check the referring website to see if it's your own with <code>.htaccess</code></p> <pre><code>RewriteEngine On RewriteCond %{HTTP_HOST}@@%{HTTP_REFERER} !^([^@]*)@@http?://\1/.* RewriteRule .*\.pdf [NC,F] </code></pre> <p>That will fail with a forbidden directive (403 error). NC is case insensitivity. The server would need to be configured to show something in the event of a 403 error.</p> <p><strong>In PHP</strong> Additionally you can check this sort of thing with a dynamic page that allows the download. Here's an example of how to do this with PHP:</p> <pre><code>&lt;a href='/download.php?f=myfile&amp;fd=mypath'&gt;Download my PDF&lt;/a&gt; </code></pre> <p>We're taking the <code>.pdf</code> off of the name in the link for security reasons. You could do something like <code>base64_encode</code> the name, but this won't stop a knowledgeable attacker from trying to exploit your system. The <code>f</code> variable is the filename (pre-period) and the 'fd' would be the folder (or path).</p> <p>Example dirs could include <code>pdfs</code> or <code>resources/pdf</code>.</p> <p>It can't start or end with a <code>/</code>. We're not allowing periods in paths or filenames so someone can't do something like <code>pdf/../../..</code>.</p> <p>Code for <code>download.php</code></p> <pre><code>&lt;?php if((preg_match('!^[A-Za-z0-9_-]+$!',$_GET['f']))&amp;&amp;(preg_match('!^[^/][/A-Za-z0-9_-]+[^/]$!',$_GET['fd']))){ //we're hard-coding the line so someone can't spoof something like .htaccess $tempPath = $_GET['fd']; $tempFilename = $_SERVER['DOCUMENT_ROOT'].'/'.$tempPath.'/'.$_GET['f'].'.pdf'; //Make sure it's a real file if(is_file($tempFilename)){ $referrer = $_SERVER['HTTP_REFERER']; $serverName = $_SERVER['SERVER_NAME']; //check the referrer if(strpos($referrer, $serverName)){ $new_filename = $_GET['f'].'.pdf'; // We'll be outputting a PDF header('Content-type: application/pdf'); // It will be called downloaded.pdf $hString = 'Content-Disposition: attachment; filename="'.$new_filename.'"'; header($hString); // The PDF source is in original.pdf readfile($tempFilename); } else { //offsite link header('Location: /download_policy.php'); exit(); } } else { //maybe an old file? Give them the homepage header('Location: /'); exit(); } } else { //hacking attempt header('Location: /'); exit(); } ?&gt; </code></pre>
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    1. POShowing PDF's with blocking direct link (.htaccess)
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    1. COThe way you said this all is really great! I'll try to use this tommorow, I'll also then reply if it worked or not!
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    2. COI tried the .htaccess file and it works perfectly! I've still got one question about it, on the 404 page I'm getting this: 'The requested URL /downloads/PDF/[NC,F] was not found on this server.' What is the [NC,F] supposed to be?
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    3. COAnd how can I specify the location of the PDF file in the <a href='/download.php?f=myfile'>Download my PDF</a> link? If I can do that that would be really perfect to use it.
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