Conditional cell lock

Hi Friends, am in some serious problem and hope somebody would get me out from trouble here.I have an sheet(see attached) with some dummy data, now i want to lock (with password) only those cells depending on the dropdown (highlighted in sheet).For eg,if we select A from dropdown of col c and then locked from dropdown of col D , it should lock the complete row(s) of value A in col H and rows with value B shall remain editable.Am counting on you guys to put me on track and your help would be immensely appreciated.

Thanks
Ankur