Protecting developed dll in c#

Question

C++ / C#

Good day, next question.

Developed a dll in c#. It is necessary to distribute it, but there was a question of protection. Please tell me what are the options for protecting the dll, so that only the developer who actually purchased it could use it to develop their applications.

Thank you!

Answer 1

You can obfuscate the code first.
And then protect the code. There are some ciphers, but they all break after some time.

Answer 2

For reliable protection, activation on the end user's computer or a hardware key is required. I doubt that this will suit the developers.