But then read-only just means unmodifiable? How does it matter whether it's a lookup table or CPU code in ROM or whatever? And the OP said "mathematically unhac

But then read-only just means unmodifiable? How does it matter whether it's a lookup table or CPU code in ROM or whatever? And the OP said "mathematically unhackable", not unmodifiable. But for me it seems completely in the open what that means, and I support my fellow poster asking for a link.