How to take a screenshot of Window's secure desktop?

I have found a rather "black hat" way of doing it...

When in a secure desktop, the accessibility tools still work just fine... so, I used my copy of FastStone Capture Portable, I went to c:\windows\system32 and renamed osk.exe to osk.exe.old and copied/renamed fscapture.exe from the Faststone directory to osk.exe inside the system32 directory.

I then went to a UAC prompt and pressed Win Key+U, and clicked on the "on screen keyboard" option.

And... FastStone Capture started, although it was just a trial... using it under this mode cannot access my license details.... I was able to take a picture just fine and save it... although, when I thought I was saving to my desktop, it actually went to c:\windows\syswow64\config\systemprofile\desktop... you learn something new every day!

Based on the above, I always thought that the UAC secure desktop was an elevated environment using your own credentials, but, I guess it is actually launched under the System user - so, Print Screen may actually work, it just isn't under the context of your user - with this in mind, if you were to use a copy of paint instead of Fast Stone Capture, take a screenshot then launch Paint through the On Screen Keyboard hack, it may just work the same!

edit --- update ---

Paint is out the window! Just tested my theory and it didn't work, I am not sure the exact reason, but, I am guessing if you use pretty much any screen capture tool and my method above, it should work.

Get a digital camera and take a picture of the screen.

However, my question remains: is there any way to get a screenshot of this desktop?

A process running as SYSTEM and installed in an appropriate location can bypass UIPI and get on to the Secure Desktop.

Leverage the existing programs that do this -- RealVNC (not the free edition, unfortunately) and UltraVNC for example.

Run the server on your PC and connect the client to it from another computer. Take a screenshot of the client window.

Although it's probably just as easy to take a picture of the screen.