About Device Information Area (DIA)

[Yasin]

Hi friends. I came across some information while reviewing the advanced PIC18 datasheet. Since my English was not good, I could not be sure if I understood it correctly. "DEVICE INFORMATION AREA" DIA section. It is said that the data here is unique for each MCU and cannot be changed. If so, I saw it as a useful feature.
For example; We did a project for a client. He will do the physical production himself. In accordance with the agreement, we delivered the HEX file. As per the agreement, we will receive payment for each mcu upload.
Question: Since the data in the DIA region is unique, can we use this for activation? E.g; Is it used to activate the software by entering a key (using a robust algorithm) via USB port or serial port or via the keypad?
Question; Can we have our designs produced as programmed without hesitation?

[okmn]

It caught my attention too (I never knew about this before your message).

but as far as I understand this region (dia store) is just a read only section.
I gathered all the related topics in one place.
I guess some of what you said/your ideas can be done if you give the pic mcu itself.

[Yasin]

Yes. That's exactly what I'm talking about. The MCU I reviewed is PIC18F47K27, similar to the one to be used on the Positron Board.

http://ww1.microchip.com/downloads/en/DeviceDoc/Microchip%208bit%20mcu%20%20PIC18%20L_F26_27_45_46_47_55_56_57K42%20low-power%20high-performance%20mcu%20with%20xlp%20tech%2040001919B.pdf