China has updated its list of technologies that are banned or restricted for export, complicating the looming sale of social media platform TikTok. TikTok's Chinese owner ByteDance has been forced to seek a US buyer after US President Donald Trump signed an executive order effectively banning the app over national security concerns. So far, Oracle and a partnership between Microsoft and Walmart have thrown their hats into the ring to buy up the wildly popular video-sharing app.