Thanks for the answer.
That’s the point. When the Internet is turned off, the validity of the license key is, as it were, limited. I can close Nomad and lock my tablet screen. Wait a few minutes or even an hour. Turn on Nomad after that without the Internet, and I will have the purchased version. I can even turn off the tablet, and turning it back on again, go to Nomad, I will again get a licensed, purchased version. But sometimes the key is lost just after closing the program, without the Internet.