/usr/share/kde4/config/plasma-overlayrc is in kde-workspace-data 4:4.8.2a-0ubuntu4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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plasma/allow_configure_when_locked=false
[Constraints]
FileDialog=false
LaunchApp=false
[General]
ExcludeCategories=Windows and Tasks,Application Launchers
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