Questions :-
To sell a C++ game library/framework/engine, does it usually have to be open-sourced?
For a C++ template class (real template), it is quite hard not to be open-sourced, correct?
If it is open-sourced, how to protect the copyright?
How to enforce people to just use it, but not copy?
... I think it is practically very hard, because people can see the source code, and "rewrite" it.
Does a shop like Unity's asset store make thing safer? If so, how?
Arrogant assumption :-
The game library/framework/engine is high-quality, well-documented, and it would be marvellously sell well.
Besides some free libraries like Bullet and Ogre, it is developed all by myself.
The library/framework/engine is not bound to any legal obligation (e.g. the most restriction is MIT).
I have these questions after reading a news :-
Muhagames develop a game named Thea Awakening (C#).
The company use its own Honey Hex Framework (C#) as a library to develop the game.
The company sell Honey Hex Framework via Unity's asset store to boost its financial position.
There are also others old examples e.g. Unity itself or Unreal, which is now open-source ... How do they protect it?
Actually, I don't plan to sell any library. I am just curious.
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