[dartho]

This is not a hack, nor a plugin or product, it is a style. There is nothing "hidden". The only PHP code is in the CSS generation which is so simple that it is transparent to anyone with even a modicum of knowledge.

Looking at the site above, it looks like the user has merged this style into his master sytle, ultimately overwriting the base vbulletin style from which all else is inherited.

The reason the copyright appears is because the footer template from this style has been merged into the master template, as have all other templates from this style. Comments such as yours just shows a lack of knowledge.

This style is not set as a master style (look in the XML), yet this has been reported on about 5 sites (out many hundreds) so either there is a bug in vBulletin somewhere allowing this to happen rarely, or there is user error.

Now to fix the problem: Upload tools.php from the vbulletin install files to your admincp, run it and rebuild the master style (I think that's what it is called - it's one of the first options)