0

The column is not protected at all. The user can access the cells and modify their value. This is the default setting.

1

The column is read-only. The user can move into any cell in the column, but cannot change its content.

2

The column is protected. Any access to the cells in that column is denied. If the user tries to move to a protected column with the keyboard, it is skipped and the cursor goes to the next valid column. If protected column is clicked, no action occurs.