Lpc2000

Hi,

I'm devoloping a aplication in LPC2129 and I want to protect
the code from reading.
I read the manual but still have some doubts:

1. Can I program the LPC2129 and then protect it from code reading
by writing the value 0x87654321 in position 0x1FC using Philips
LPC2000 Flash Utility? How to do that?

2. After protecting the LPC can I erase it and reprogram it?

Thanks.
Rui Gonçalves