Paste Only Values Locked Cells

[SensualCarrots]

I am using the following code I found somewhere in a workbook to prevent traditional pasting to avoid wiping out cell formatting. I only want to allow paste values.

Private Sub Workbook_SheetSelectionChange(ByVal sh As Object, ByVal Target As Range)

    If Sheet3.UnlockWorkbookCheckbox = False Then
        On Error Resume Next
        Target.PasteSpecial xlPasteValues
        Application.CutCopyMode = True
    End If


End Sub

The problem is that for some reason, once copied, values will be pasted into any cell on the worksheet, regardless if they are locked or not. And yes, the worksheet is protected, but it's protected via the below code which I suspect may be the problem... I commented the entire code block, and it prevents all pasting, including values. Any ideas?

Sheet3.Protect Password:="password", UserInterfaceOnly:=True