Hi, I can do your project on this way, I will create javascript file to make two icons and actions(background remove and font change) , to protect file is impossible only can do javascript hard to read with optimize and minimize code , that javascript will insert with script tag, if you have some database and API keys then that file can insert with php page where that page will check API and domain and if ok will read javascript file. If you have question you can contact me. Regards