Clear Screen Lock

[cyberjun]

Hi,
Is there a utility for Linux which locks the screen in a transparent manner. So when you lock your screen, your desktop is still visible (with all the activity, not just a screenshot). However when you access keyboard or mouse, a dialog box comes up asking for password.
I searched google. There is a utility for windows based systems. However could not find anything for Linux.

cheers,
--cyberjun

[Sadako]

xtrlock, it's in portage.

Once you start it (via a keybinding being the easiest way), the cursor is replaced with a small blue padlock.
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[cyberjun]

Thanks