Code protection how?

Question

Programming

Tell me, please, what are the methods of protecting the code from viewing?
The interaction structure is as follows: There is a protected code and there is a C code that must use the functions from the protected code . The protected code can be in any form (binary, dll - I don’t know), the main thing is that it can be used from another C code and its source code cannot be seen.

Answer 1

And what's the problem then? Compile the code into a dynamic library and use it to your health.

Answer 2

As I understand it, it's about obfuscation . Well, it is worth noting that not a single obfuscation can resist targeted reverse engineering.

Answer 3

I know only one thing for sure: If you can create something, then you can also break it. If a person needs, whatever you do, he will see it. Another thing is protection from just "curious", pack it.

Answer 4

Try an example from the article habrahabr.ru/blogs/freelance/115923/
This is the work of an obusfactor. But, as you can see, you can decipher everything if you want.
Also, I recommend taking care of the legal side of code protection - read about this in the Civil Code of the Russian Federation, part 4.