The Microsoft windows operating system software in the United States automatically obtains the copyright in the United States according to the provisions of the American copyright law. At the same time, because China's Copyright Law and other laws and regulations also stipulate that the copyright of computer software is automatically obtained according to law, both China and the United States have joined the Berne Convention for the Protection of Literary and Artistic Works and other international intellectual property conventions. According to the principle of national treatment, China also gives copyright legal protection to computer software completed by American civil subjects in the United States, so the operating system can be protected by copyright law in both China and the United States.