The terms below apply to personal usage only. An altered case applies to business users, please refer to the commercial or business use terms.
Furthermore, account sharing is not allowed with any license.
1 device license
You may use the application only on one device at a time. You must uninstall the application before using it on another device. From that moment on, you're no longer allowed to use the application on the previous device. If you want to use the application on more than one device (for example, a desktop and a laptop), you must purchase another license.
10 devices license
You may use the application on up to 10 devices at a time. If you've used the application on 10 devices, you can uninstall the application from one of the devices. From that moment on, you're no longer allowed to use the application on the previous device. It's not allowed to share an account between multiple households and attempting to do so will result in your account being blocked.
You may use the application on any device as long as you're signed in with your Steam account. You can only have one active session per Steam account.