I have almost finished a small application. I found several clients and thought about monetization. I decided to sell licenses. I have never encountered the creation of keys for the program. What software for creating license keys do you use? Or is it better to write the key generator by myself? How do you prefer to do? Desirable free or low cost solutions.
If you feel that you can write a key generation program by yourself, just do it! There may be ready-made parts of the program, some blanks for generating keys on GitHub. Also, you can try ready-made solutions like ArmDot. They are paid. There are various licensing systems. Specify which programming language do you use and you'll get more good answers.