Like I said, I'm not sure how it works. A little Googling turns up encrypted loaders for 18F and up only, don't know if they exist for 16F. If they don't exist then perhaps the reason for that is A) limited amount of memory (RAM and/or flash) or B) doesn't work with code protect. I'm afraid I don't know. I highly recommend really checking that with the supplier of the bootloader.

/Henrik.