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    <p><strong>Update:</strong></p> <p>Example:</p> <p><a href="http://www.pitgroup.nl/demo/protect/?file_id=1&amp;user_id=1&amp;file=string" rel="nofollow noreferrer">http://www.pitgroup.nl/demo/protect/?file_id=1&amp;user_id=1&amp;file=string</a></p> <p>The file=string, does not work, because it is not correct with the database value;</p> <p>The page then shows a link with the correct database value which you can click to view the hidden file. The link you clicked is still at the top then, but it will not work again. The bottom of the page shows the update database value, which is a valid link again.</p> <p>To prevent hotlinking, you should actually use htacces i think.</p> <p>You should do like this:</p> <p>( or something like it )</p> <pre><code>mysql: files: id url created user_files: id user_id file_id string </code></pre> <p>then insert a record into user_files, using the files info, and for the string, do something like: </p> <pre><code>md5( $file-&gt;url . $file-&gt;created . $user-&gt;id ); </code></pre> <p>when a user calls an url, eg:</p> <p>files / fileid / sldfjsdfasduapdj123</p> <p>then you reroute it to a script, that does a lookup in the database for that string, comparing the user id and file id in the record.</p> <p>after the file has been looked up, md5 the string again and save the record.</p> <p>provide the user with headers of the requested file, look at <a href="http://php.net/manual/en/function.header.php" rel="nofollow noreferrer">http://php.net/manual/en/function.header.php</a></p> <p>and your done :)</p> <p>( i use this for a websitet that provides flv content against sms payments )</p>
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    1. POHow to make a subdomain + files on it, acessible to people with special privileges?
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    1. POHow to make a subdomain + files on it, acessible to people with special privileges?
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    1. COBut once the true location of the file has been revealed, once the download starts... a user might post the URL elsewhere and people are free to hotlink. Unless Im not understanding something here....
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    2. COi think you misunderstand you never provide the real url, you serve the file via php: header(the header of the document type); readfile( $file->url ); thenyou make the current url invalid by changing the string in the database. so in short: user is logged in user visits files / 1 / hakenfufidmdm php: this is file 1, is there a arecord in user_files with this file id and the user id? php: yes there is, show file headers and readfile php we do not need this string anymore, change it after that, the url is no more valid :)
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    3. COneed an example ? :P
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