are you allowed to short the stock during the period when you are not allowed to sell the RSU’s? In other words, is it possible to create a liability (the short

are you allowed to short the stock during the period when you are not allowed to sell the RSU’s? In other words, is it possible to create a liability (the short position) that exactly offsets your asset (the RSU’s that are ‘delivered’ but that you can’t sell)?