Datatable - editable columns

I have a datatable with six columns. The first four columns contain data that is downloaded from a website. The first column is the date and the next three are numeric. The last two columns are calculated (col 2 - col 3 and col 2 - col 4).

Editable is set to True for the datatable. I would like only columns 2, 3 and 4 to be editable. The date column and the calculated columns should not be editable. I can’t find a way to do this. Any ideas?