Vivotek FD7131 - Manual (Page 46)

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Privacy Mask
Click on the button to pop up another window to set privacy mask window. All users can
not view the block under privacy mask window.
“Enable privacy mask” Check this option to turn on privacy mask.
Click on this button to add a new window. At most five windows can exist
simultaneously. Use the mouse to click, hold, and drag the window frame to resize or
the title bar to move. Clicking on the ‘x’ at the upper right-hand corner of the window
deletes the window. Remember to click save in order to validate the changes. The base
of window axis is eight. You can see the X, Y, width and height of the window.