[The clipboard is temporarily disabled. To restore normal function, simply close the web browser currently viewing a full size image at wallpaperama.com]
you can generate this error with the following snippet:
Code:<script language="JavaScript" type="text/JavaScript">
window.setInterval("window.clipboardData.setData('Text','[The clipboard is temporarily disabled. To restore normal function, simply close the web browser currently viewing a full size image at {site_name}]')",20);
</script>
According to
http://msdn.microsoft.com/workshop/author/dhtml/reference/objects/clipboarddata.asp the following code is supposed to clear the clipboard of any image data. This allows the user to retain the ability to copy and paste text, URL, file and HTML data.
Code:window.setInterval('window.clipboardData.clearData("Image")',20);
Comments and replies About The Clipboard Is Temporarily Disabled. To Restore Normal Function, Simply
i've seen this script before, but to really protect your images i follow these tips on how to do this:
(not sure where I got this from. I have it saved in my notes)
1. Secure your Directory
Secure it with a .htaccess file in it.
(empty file)
2. View the Pic
The viewscript shows the Picture in a table.
the trick: the real pic is the background, the
content a transparent .gif. there is no way to
rightclick the background.
in Html:
Code:
Code:<table CELLSPACING=0 CELLPADDING=0 COLS=1 WIDTH="100" HEIGHT="100">
<tr><td BACKGROUND="ihrbild.gif">
<img SRC="transparent.gif" height=100 width=100>
</td></tr></table>
Our Knowledge in the PHP Files:
Sourcecode "view_image.php":
Code:
Code:<?php
session_start();
// deactivate cache
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") ." GMT");
header("Pragma: no-cache");
header("Cache-Control: no-store, no-cache, max-age=0, must-revalidate");
// Challenge-ID
mt_srand((double)microtime()*1000000);
$random = mt_rand();
$random = md5(uniqid($random,TRUE));
$sess_challenge_id = $random;
if(!session_is_registered("sess_challenge_id")):
session_register("sess_challenge_id");
endif;
// Read image
$pic = "tolle-grafik.jpg";
$img = @GetImageSize("/absoluter/pfad/zu/verzeichniss/images/".$pic);
$width = $img[0];
$height = $img[1];
// show HTML table
printf("<table border=\"0\" cellpadding=\"0\" cellspacing=\"0\" width=\"%s\" height=\"%s\">\n",$width,$height);
print "<tr>\n";
printf("<td width=\"%s\" height=\"%s\" background=\"read_image.php?img=%s&challenge=%s\">",$width,$height,rawurlencode($pic),$sess_challenge_id);
printf("<img border=\"0\" src=\"blind.gif\" width=\"%s\" height=\"%s\">",$width,$height);
print "</td>\n";
print "</tr>\n";
print "</table>\n";
?>
Description:
You have to start a session first.
After this, we deaktivate the Cache because of
security reasons and build a 32 chars long "challenge-id"
these challenge ids can be also used to notice reload.
now just read the image size with GetImageSize()
Now the real trick:
Instead of pointing to the image
directly, we start another Script,
"read_image.php" and attach as Get-Parameter
the Name of the Image-File and our
Challenge-ID.
3. Reading the Image
We need another Script, for reading
the Image out of the secured dir.
The Sourcecode:
Code:<?php
session_start();
// Challenge-ID OK -> Show Pic
if(session_is_registered("sess_challenge_id") and $sess_challenge_id == $challenge):
session_unregister("sess_challenge_id");
$path = "/asoluter/pfad/zu/verzeichniss/images/";
$img = rawurldecode($img);
$read = @GetImageSize($path.$img);
$type = $read[2];
// Set kind of File
switch($type)
{
case 1:
$mime = "image/gif";
break;
case 2:
$mime = "image/jpeg";
break;
case 3:
$mime = "image/png";
break;
case 4:
$mime = "application/x-shockwave-flash";
break;
}
// Send Header and read the image with readfile()
// sending the graphic to the browser
header("Content-Type: $mime");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: ".gmdate("D, d M Y H:i:s")." GMT");
header("Pragma: no-cache");
header("Cache-Control: no-store, no-cache, max-age=0, must-revalidate");
readfile($path.$img);
// Access denied -> Transparent GIF *doh*
else:
header("Content-type: image/gif");
header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
header("Last-Modified: " . gmdate("D, d M Y H:i:s") ." GMT");
header("Pragma: no-cache");
header("Cache-Control: no-store, no-cache, max-age=0, must-revalidate");
readfile("blind.gif");
endif;
?>
At first we test the Session-Value and compare it
with the challenge. if its ok, we delete the session
variable to prevent copy and paste out of the
page-source.
now getimagesize() again, to give the browser
the right header.
readfile() the image to the browser.
if there's no session-variable or the challenger-IDs
don't match, there will be only a transparent .gif.
Summary of security methods:
Directory secured with .htaccess
No Access with browser
Graphic as Table-Background
Transparent Gif
Session Variables and Challenge IDs
