How to restrict access to files in linux (raspberry pi)?

Question

linux

There are python scripts that work under the control of raspberry pi, orange pi pc (mini computers with autoload from sd card).
Since the hardware works on the customer's side, I want to protect the code from outside interference (to eliminate the desire for self-tuning from the client or copy / theft).
What are the best methods to use for this?

Answer 1

Encrypt flash drive. And it's better just not to store the code on it.
Python scripts are very difficult to securely hide.
The maximum that can be done is to use cython + .pyd

Answer 2

compile to executable?? it will be harder to reverse it.
nuitka cython, etc.

Answer 3

Don't use Python.