One option would be to check the Ethernet MAC address, but this can be spoofed.
An alternative would be to use the serial number in /proc/cpuinfo such as in this Xojo thread.
Such efforts should prevent most of the casual copying. However, a determined programmer can defeat that as well. See Dimitry's answer on a different thread.
I can confirm, after having used the Bela shield on top of a Beaglebone Black, that its latency is extremely low (<1ms) and quite capable of doing calculations on audio.
The normal shield has 2 jack microphone inputs and 1 jack stereo output.
Strictly speaking, you have to buy the version that comes with jack adapters, though.
I do believe more inputs/...
Convert linux C++ printer program to Rpi python
The slightly tricky part is that Rpi has no write 8 bit port function.
So we need to DIY our own virtual 8 bit port by abstracting 8 GPIO
pins as one fake 8 bit port. We can then write a fake write fake 8
bit port function, ...
Centronics/Parallel Port Printer Cable - ...
To be able to link an SQLite3 program you need the libsqlite3 (run-time) and libsqlite3-dev (development) libraries installed.
Install those with sudo apt install libsqlite-dev (which will pull in the run-time dependency).