is it possible to restrict manual entry even copy paste in a cell.

I have data where I don't want anyone to enter data manually for SAT ,SUN and Holidays.

I have done a data validation for SAT , SUN and holidays. I want them to choose it from the list whatever they have been given.

I am already using a code where cut,copy,past and dragging have been disabled using short cuts but cut copy paste is there in the menu.

I don't want to disable that as I would need that later.

on a whole I don't want users to manually put the data in SAT ,SUN and wherever its a holiday.

Thanks in advance