Recently I have been to open-source stuff and most of the time I license my projects under MIT License.
While open-sourcing projects, how do I "exclude" certain files and assets like "logos", "databases",etc from being open-sourced (Other words my Intellectual property) ? Like For Eg. If we have a built open source game lets say. How do I prevent game graphics, avatars, etc from being open-sourced but allow the game engine to be open source?