Lock all cells but those just inserted.

Hey guys, as you may see from the attachment I have a simple working code which in summary does what follows:
Unprotect cells, run macro, protect cells.

The macro's job is to insert rows that it can do, now what I was wondering is if there any chance I may lock every cell/row (i.e. those rows with data already in them) in the sheet except for cells A, C and D of just the recently added rows.

Regards and thanks in advance,