Hi Patrick,
You can disable the Move/Copy option in the right-click popup menu with the code:
Sub DisableCopy()
CommandBars("Ply").Controls("&Move or Copy...").Enabled = False
End Sub
This disables it for the Excel application, so will apply to all sheets.
Put this in a standard macro module in the workbook (keyboard Alt-TMV, then Alt-IM, paste code into VBE code pane). To run the macro go back to Excel, type Alt-TMM, select macro and Run.
Don't forget to set it back to True when done. To automatically reset it when the workbook closes, put the statement that resets it into the ThisWorkbook Close event (right-click on the Excel icon at the left end of the Worksheet Menu Toolbar, select View code and enter
Private Sub Workbook_BeforeClose(Cancel As Boolean)
CommandBars("Ply").Controls("&Move or Copy...").Enabled = True
End Sub-