Copyrighted and safe. The videos downloaded by Quark are copyrighted and safe, because any text, pictures, graphics, audio or video materials contained in the network services provided by Quark are protected by copyright, trademark or other property ownership laws and are copyrighted. Quark has added a sandbox function to the developer function, which can simulate the browser operating environment, isolate some core functions of the website, and enable it to run normally, thus protecting user privacy and security. Therefore, the videos downloaded by Quark are copyrighted by Apple. Safety.