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	Private Sub Workbook_Activate() 
	  Workbook_SheetActivate ActiveSheet 
	End Sub 
	  
	Private Sub Workbook_Deactivate() 
	  For k = 1 To 255 
	    Application.OnKey "{" & k & "}" 
	  Next k 
	End Sub 
	  
	Private Sub Workbook_Open() 
	  Workbook_SheetActivate ActiveSheet 
	End Sub 
	  
	Private Sub Workbook_SheetActivate(ByVal Sh As Object) 
	    
	  Dim Datum As Range 
	  Set Datum = Sh.Range("D5") 
	    
	  If IsDate(Datum) And Datum < Date Then 
	     
	      Sh.Unprotect "passwort" 
	      Sh.Cells.Locked = True 
	      Sh.Protect Password:="passwort" 
	      
	    If Sh.ProtectContents Then 
	    Meldung 
	    End If 
	    End If 
	     
	    End Sub 
	     
	    Sub Meldung() 
	     
	    Dim k As Integer, passwort As String 
	     
	      Do 
	        passwort = InputBox("Dieser Monat ist gesperrt. " _ 
	        & "Geben Sie das korrekte Passwort ein. ") 
	  
	>>>>>hier, dachte ich, muss unterschieden werden, ob OK oder Abbrechen geklickt wird. 
	>>>>>bei OK soll eine Mail öffnen, bei Abbrechen soll die Checkbox verschwinden. 
	  
	            
	      If passwort <> "" Then 
	          On Error GoTo Fehler 
	          ActiveSheet.Unprotect passwort 
	          On Error GoTo 0 
	          End If 
	      Loop Until Not ActiveSheet.ProtectContents Or passwort = "" 
	       
	       If passwort = "" Then 
	        For k = 1 To 255 
	          Application.OnKey "{" & k & "}", "DieseArbeitsmappe.Meldung" 
	        Next k 
	      Else 
	        For k = 1 To 255 
	          Application.OnKey "{" & k & "}" 
	        Next k 
	       
	  
	  End If 
	    
	Exit Sub 
	  
	Fehler: 
	  MsgBox "Das eingegebene Passwort ist ungültig" 
	  Resume Next 
	    
	End Sub 
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