diff --git a/ICSharpCode.AvalonEdit/Editing/EditingCommandHandler.cs b/ICSharpCode.AvalonEdit/Editing/EditingCommandHandler.cs
index fcdda52c..665256de 100644
--- a/ICSharpCode.AvalonEdit/Editing/EditingCommandHandler.cs
+++ b/ICSharpCode.AvalonEdit/Editing/EditingCommandHandler.cs
@@ -279,7 +279,7 @@ static void CanDelete(object target, CanExecuteRoutedEventArgs args)
 			// HasSomethingSelected for delete command
 			TextArea textArea = GetTextArea(target);
 			if (textArea != null && textArea.Document != null) {
-				args.CanExecute = !textArea.Selection.IsEmpty;
+				args.CanExecute = !textArea.Selection.IsEmpty && textArea.ReadOnlySectionProvider.CanInsert(textArea.Caret.Offset);
 				args.Handled = true;
 			}
 		}
@@ -291,7 +291,7 @@ static void CanCutOrCopy(object target, CanExecuteRoutedEventArgs args)
 			// HasSomethingSelected for copy and cut commands
 			TextArea textArea = GetTextArea(target);
 			if (textArea != null && textArea.Document != null) {
-				args.CanExecute = textArea.Options.CutCopyWholeLine || !textArea.Selection.IsEmpty;
+				args.CanExecute = (textArea.Options.CutCopyWholeLine || !textArea.Selection.IsEmpty) && (args.Command != ApplicationCommands.Cut || textArea.ReadOnlySectionProvider.CanInsert(textArea.Caret.Offset));
 				args.Handled = true;
 			}
 		}