Indeed,

UltraVnc now use a layered window for screen blanking.
Black screen or custom bmp (if background.bmp exist on server site,
this image is stretch on the remote display)

The trick is quite simple:
Make a fullscreen layered window and desactivate the layered capturing.

Effect: VNC does not longer capture the layer and show what is below.
But the user on the server site see the layer :)

There are some disadvantages,
+ effect is the same as disabling layer capturing,
some updates are missing.
+some parts (mouse, moving icons..) popup on top of the server display.

max 100 lines of code to add
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