While modifying the files of VSeeFace itself is not allowed, injecting DLLs for the purpose of adding or modifying functionality (e.g. using a framework like BepInEx) to VSeeFace is allowed. Analyzing the code of VSeeFace (e.g. with ILSpy) or referring to provided data (e.g. VSF SDK components and comment strings in translation files) to aid in developing such mods is also allowed. Mods are not allowed to modify the display of any credits information or version information.