Preventing users copying over data validation | Excel forum

I am using a spreadsheet that has a number of cells where data needs to be input by the user. Many of these have data validation set to a list to ensure the data input is correct. However, it is all too common that data is copied and pasted into the cell containing the validation rather than selecting an entry from the validation list. This replaces the cell containing the validation and allows any value to be input. Is there a way to ensure that the cell cannot be copied over but the data from the validated list can be selected?
My attempts to protect cells in the worksheet to prevent data being copied and pasted over the validated cell have meant that no data can be entered into the cell regardless of whether it is selected from the withinn the data validation list.