The following might work:
Code:
Sub ChangeCCToNoDelete()
' Macro to set all Content Controls to locked (no delete)
' Written by Charles Kenyon 2013-11-06
Dim oCC As ContentControl
For Each oCC In ActiveDocument.ContentControls
oCC.LockContentControl = True
Next oCC
End Sub
See
Installing Macros for direction on how to use this.
I have not tested this extensively, but it seems to work.