Everyone knows that plugins are only supported in Unity Pro. It's also a common knowledge here (on Forums and Answers) that if you have a native dll, you have to put it in Plugins folder and own the Pro license to be able to use it. Actually this knowledge is wrong, at least on Windows. The documentation states that plugins are native libraries, but it doesn't state that every native library is a plugin. So, you can call functions from native libraries without the Pro license. 1. Download the standard plugin example from here. 2. Run it using free Unity and get the error "License error. Plugins are only supported in Unity Pro!" 3. Move the dll from Project/Assets/Plugins to just Project/. 4. Run it again and get no errors. It works fine. 5. Make a standalone build, copy the dll to where the executable is, and it will work too.