How can you protect your application from illegal copying?

Question

Encryption

Of course, I understand that it is impossible to protect yourself from piracy in principle. But still there are some methods that significantly complicate the distribution of illegally copied software? Bring your ideas. Thanks in advance!

Answer 1

Software that cannot work without a server part that checks the license.

Answer 2

Monthly key renewal via the Internet by exchanging the previous one for a new one.