There are some disadvantages of the internet of things. Security is one of the biggest challenges in the world of IoT. Users may share sensitive data among objects and risk a breach, but they should be aware of the security risks of the Internet and learn how to avoid them. Also, users may not pay enough attention to the privacy of their data, and IoT may intrude into their intimacy. Therefore, the intellectual property of IoT devices is a highly controversial issue. We should pay more attention to security, privacy, and intellectual property when we use the Internet of Things.