How and on what is it better to make a dll for the game so that it can be used only in one project?

Question

Unity

That is, this is something like a condition of use, but I would like software protection (in the form of compilation into machine code).
As I understand it, it will be necessary to do a dll for each platform?

Answer 1

That's the point of a DLL, that it can be used independently of the project. Yes, you can make it difficult to analyze it by making one exportable function with 100500 parameters, but it's still a matter of time and desire of the "enemy". Well, under .NET it’s a pipe in general, you can use your classes and add methods to them without asking you about it :)